Enumerator#peek

Enumerator#peek [email protected]_$9$k$N$O$I$&$G$7$g$&$+!#e(B

Enumerator
e$B$+$i%G!<%?$rFI$=P$9$H$-!"@hFI$$r$7$?$/$J$k$3$H$,$"$j$^$9!#e(B

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e$B$a$?$$$H$9$k$H!"0J2<$N$h$&$K<!$NMWAG$H$NHf3S$r$7$?$/$J$j$^$9!#e(B

a = %w[banana banana durian orange orange orange]
e = a.to_enum
n = 0
loop {
word = e.next
n += 1
if e$B<!$NMWAG$,B8:$7$Fe(B word e$B$H$O0[$J$k$+!"B8:$7$J$$e(B
puts “#{word} #{n}”
word = nil
n = 0
end
}

e$B$7$+$7!"$3$3$Ge(B Enumerator#next
e$B$O;H$($^$;$s!#;H$C$F$7$^$&$H!"e(B
e$B%k!<%W$N<!$N2s$G07$&$Y$-MWAG$r>CHq$7$F$7$^$$$^$9!#e(B

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e$B$K$/$/$J$j$^$9!#$^$?!":G8e$NC18l$N=hM}$r%k!<%W$,=*$o$C$?8e$Ke(B
e$B$9$k$3$H$K$J$C$F!"3FC18lKh$K9T$&=hM}$,%k!<%W$NCf$H8e$K$U$?$De(B
e$BI,MW$K$J$C$F$7$^$$$^$9!#$?$H$($P!"0J2<$N$h$&$K=q$1$^$9$,!“e(B
e$B%3!<%I$N=EJ#$,@8$8!”$^$?Fq$7$/$J$C$F$$$^$9!#e(B

% ./ruby -e ’
a = %w[banana banana durian orange orange orange]
e = a.to_enum
n = 0
prev = nil
loop {
word = e.next
if prev && prev != word
puts “#{prev} #{n}”
n = 0
end
prev = word
n += 1
}
if prev
puts “#{prev} #{n}”
end

banana 2
durian 1
orange 3

e$B31$5$s$NH/I=$GCN$C$?$s$G$9$,!"$3!<$f!<$N$C$F%3%s%H%m!<%k%Ve(B

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e$B$,$”$l$P!":G=i$K=q$$$?!"%k!<%W$N$R$H$^$o$j$4$H$K$R$H$D$NMWAGe(B
e$B$r=hM}$9$k$H$$$&7A$G5-=R$G$-$^$9!#$=$&$$$&%a%=%C%I$re(B
Enumerator#peek e$B$H$9$k$H!"0J2<$N$h$&$K=q$1$^$9!#e(B

% ./ruby -e ’
a = %w[banana banana durian orange orange orange]
e = a.to_enum
n = 0
loop {
word = e.next
n += 1
if begin word != e.peek; rescue StopIteration; true end
puts “#{word} #{n}”
word = nil
n = 0
end
}

banana 2
durian 1
orange 3

e$B$^$!!"e(Brescue e$B$9$k$N$O8+6l$7$$$N$G!"0z?t$r;XDj$7$?$ie(B
StopIteration e$BNc30$N$+$o$j$K0z?t$rJV$9$h$&$K$7$?$i$$$$$+$J!“e(B
e$B$J$I$H$$$&$3$H$b9M$($i$l$^$9$,!“4pK\E*$J%”%$%G%”$H$7$F$O$I$&e(B
e$B$G$7$g$&$+!#e(B

e$B$3$3$G!“MWAG$NJB$S$+$i$3$&$d$C$F>pJs$r$^$H$a$F$$$/$H$$$&$N$O!“e(B
%w[banana banana durian orange orange orange]
e$B$H$$$&J?C3$J9=B$$+$ie(B
[%w[banana banana], %w[durian], %w[orange orange orange]]
e$B$H$$$&[email protected][email protected]$H$b$$J$;$^$9$N$G!"@hFI$$,I,e(B
e$BMW$K$J$k$H$$$&$N$O$h$/$”$k$b$N$G$”$k$HA[Dj$G$-$^$9!#$=$7$F!“e(B
[email protected]$+$i$NN?d$H$7$F!"@hFI$_$O$R$H$D$G:Q$$3$H$,B?$$!”$He(B
e$B$$$&$3$H$bM=A[$G$-$^$9!#$D$^$je(B Enumerable#peek [email protected](B
e$BFI$$rDs6!$9$k$3$H$+$i!"$h$/$"$k>u67$KBP1~$G$-!"$+$D!"$3$l$he(B
e$B$je(B (e$BJ#[email protected]$
$rDs6!$9$k$h$&$Je(B)
e$B0lHL2=$7$F$b$=$l$[$I1W$O$Je(B
e$B$$!"$H$$$&;EMM$K$J$C$F$$$k$H$$$($k$N$G$O$J$$$G$7$g$&$+!#e(B

e$B$J$*!"$A$g$C$H$7$?I{:nMQ$H$7$F!"e(BStopIteration
e$B$,H/@8$7$?8e$K!"e(B
Enumerator#next [email protected];~!“e(B(e$B7+$jJV$7$N:G=i$KLa$k$N$G$O$J$/e(B)
e$B$:$C$He(B StopIteration e$B$,H/@8$9$k$h$&$KJQ$($F$”$j$^$9!#e(B

e$B$3$l$O!“0J2<$N$h$&$JM}M3$,$”$j$^$9!#e(B

  • ARGF e$B$de(B tty e$B$Je(B IO
    e$B$J$I$N7P83$+$i=*N;$OJ#?t2s8!=P$G$-$?$[$&e(B
    e$B$,NI$$e(B
  • peek e$B$GH/@8$7$?e(B StopIteration e$B$G:G=i$KLa$i$l$k$H:$$ke(B
  • IO e$B$r85$K:n$C$?e(B Enumerator e$B$G$O$b$H$b$H$=$&$J$ke(B
  • 1.8 e$B$Ne(B Generator e$B$G$O$=$&$J$ke(B
  • e$BK\Ev$K7+$jJV$7$N:G=i$KLa$j$?$$$J$ie(B rewind e$B$,$"$j!"$=$l$Oe(B
    IO e$B$G$be(B (seek e$B$G$-$l$Pe(B) e$BF0$/e(B

% svn diff --diff-cmd diff -x ‘-u -p’
Index: enumerator.c

— enumerator.c (revision 24304)
+++ enumerator.c (working copy)
@@ -32,6 +32,7 @@ struct enumerator {
VALUE args;
VALUE fib;
VALUE dst;

  • VALUE lookahead;
    VALUE no_next;
    };

@@ -59,6 +60,7 @@ enumerator_mark(void *p)
rb_gc_mark(ptr->args);
rb_gc_mark(ptr->fib);
rb_gc_mark(ptr->dst);

  • rb_gc_mark(ptr->lookahead);
    }

static struct enumerator *
@@ -281,6 +283,7 @@ enumerator_init(VALUE enum_obj, VALUE ob
if (argc) ptr->args = rb_ary_new4(argc, argv);
ptr->fib = 0;
ptr->dst = Qnil;

  • ptr->lookahead = Qundef;
    ptr->no_next = Qfalse;

    return enum_obj;
    @@ -361,6 +364,7 @@ enumerator_init_copy(VALUE obj, VALUE or
    ptr1->meth = ptr0->meth;
    ptr1->args = ptr0->args;
    ptr1->fib = 0;

  • ptr1->lookahead = Qundef;

    return obj;
    }
    @@ -519,6 +523,7 @@ next_init(VALUE obj, struct enumerator *
    VALUE curr = rb_fiber_current();
    e->dst = curr;
    e->fib = rb_fiber_new(next_i, obj);

  • e->lookahead = Qundef;
    }

/*
@@ -526,8 +531,8 @@ next_init(VALUE obj, struct enumerator *

  • e.next => object
  • Returns the next object in the enumerator, and move the internal
    • position forward. When the position reached at the end, internal
    • position is rewound then StopIteration is raised.
    • position forward. When the position reached at the end,
      StopIteration
    • is raised.
    • Note that enumeration sequence by next method does not affect other
    • non-external enumeration methods, unless underlying iteration
      @@ -540,6 +545,16 @@ enumerator_next(VALUE obj)
      {
      struct enumerator *e = enumerator_ptr(obj);
      VALUE curr, v;
  • if (e->lookahead != Qundef) {

  •    v = e->lookahead;
    
  •    e->lookahead = Qundef;
    
  •    return v;
    
  • }

  • if (e->no_next)

  • rb_raise(rb_eStopIteration, “iteration reached at end”);

  • curr = rb_fiber_current();

    if (!e->fib || !rb_fiber_alive_p(e->fib)) {
    @@ -550,7 +565,7 @@ enumerator_next(VALUE obj)
    if (e->no_next) {
    e->fib = 0;
    e->dst = Qnil;

  • e->no_next = Qfalse;
  • e->lookahead = Qundef;
    rb_raise(rb_eStopIteration, “iteration reached at end”);
    }
    return v;
    @@ -558,6 +573,32 @@ enumerator_next(VALUE obj)

/*

  • call-seq:
    • e.peek => object
    • Returns the next object in the enumerator, but don’t move the
      internal
    • position forward. When the position reached at the end,
      StopIteration
    • is raised.
  • */

+static VALUE
+enumerator_peek(VALUE obj)
+{

  • struct enumerator *e = enumerator_ptr(obj);
  • VALUE v;
  • if (e->lookahead != Qundef) {
  •    v = e->lookahead;
    
  •    return v;
    
  • }
  • v = enumerator_next(obj);
  • e->lookahead = v;
  • return v;
    +}

+/*

    • call-seq:

    • e.rewind => e

    • Rewinds the enumeration sequence by the next method.
      @@ -575,6 +616,7 @@ enumerator_rewind(VALUE obj)

      e->fib = 0;
      e->dst = Qnil;

  • e->lookahead = Qundef;
    e->no_next = Qfalse;
    return obj;
    }
    @@ -868,6 +910,7 @@ Init_Enumerator(void)
    rb_define_method(rb_cEnumerator, “with_index”,
    enumerator_with_index, -1);
    rb_define_method(rb_cEnumerator, “with_object”,
    enumerator_with_object, 1);
    rb_define_method(rb_cEnumerator, “next”, enumerator_next, 0);
  • rb_define_method(rb_cEnumerator, “peek”, enumerator_peek, 0);
    rb_define_method(rb_cEnumerator, “rewind”, enumerator_rewind, 0);
    rb_define_method(rb_cEnumerator, “inspect”, enumerator_inspect, 0);

Index: test/ruby/test_enumerator.rb

— test/ruby/test_enumerator.rb (revision 24304)
+++ test/ruby/test_enumerator.rb (working copy)
@@ -130,5 +130,27 @@ class TestEnumerator < Test::Unit::TestC
assert_equal(3, e.next)
assert_raise(StopIteration) { e.next }
end
+

  • def test_peek
  • a = [1]
  • e = a.each
  • assert_equal(1, e.peek)
  • assert_equal(1, e.peek)
  • assert_equal(1, e.next)
  • assert_raise(StopIteration) { e.peek }
  • assert_raise(StopIteration) { e.peek }
  • end
  • def test_next_after_stopiteration
  • a = [1]
  • e = a.each
  • assert_equal(1, e.next)
  • assert_raise(StopIteration) { e.next }
  • assert_raise(StopIteration) { e.next }
  • e.rewind
  • assert_equal(1, e.next)
  • assert_raise(StopIteration) { e.next }
  • assert_raise(StopIteration) { e.next }
  • end
    end

e$B$1$$$8$e!w$$$7$D$+$G$9e(B.

In [ruby-dev:38932] the message: “[ruby-dev:38932] Enumerator#peek”,
on Jul/28 18:45(JST) Tanaka A. writes:

Enumerator#peek [email protected]_$9$k$N$O$I$&$G$7$g$&$+!#e(B

e$B$3$H$5$ie(B, peeke$B$KH?BP$9$k$o$1$G$b$J$$$G$9$,e(B…

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e$B$]$$$+$be(B.

a = %w[banana banana durian orange orange orange]
a.group_by{|w| w}.each{|key, values| puts “#{key} #{values.size}”}

MapReducee$B7O$G$O>e5-$N$h$&$J46$8$G=q$/$3$H$,B?$$$H;W$$$^$9e(B.

e$B<jA0$_$=$NOC$G$9$,e(B, fairye$B$G$Oe(B
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a = %w[banana banana durian orange orange orange]
a.inject_by(proc{|w| w}){|key, values| puts “#{key} #{values.size}”}

e$B$N$h$&$J46$8$N5-=R$K$J$kM=Dj$G$9e(B.

e$B$^$?e(B, each_conse$B$rMQ$$$Fe(B

a = %w[banana banana durian orange orange orange]
a.push nil #-------------------------------------------(1)
e = a.to_enum
n = 0
e.each_cons(2) do |word, peek1|
n += 1
if word != peek1
puts “#{word} #{n}”
word = nil
n = 0
end
end

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__
---------------------------------------------------->> [email protected](B
e$B7=<ye(B <<—
---------------------------------->> e-mail: [email protected] <<—

e$B$1$$$8$e!w$$$7$D$+$G$9e(B.

In [ruby-dev:38933] the message: “[ruby-dev:38933] Re:
Enumerator#peek”, on Jul/28 23:36(JST) [email protected]=<ye(B writes:

e$B<jA0$_$=$NOC$G$9$,e(B, fairye$B$G$Oe(B groupinge$B$7$?7k2L$re(Binjecte$B$9$k=hM}$,$+$J$je(B
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e$B$J$C$F$$$^$9e(B. e$B$=$&$7$?>l9ge(B, Rubye$BN.$K=q$1$Pe(B:

a = %w[banana banana durian orange orange orange]
a.inject_by(proc{|w| w}){|key, values| puts “#{key} #{values.size}”}

e$B$N$h$&$J46$8$N5-=R$K$J$kM=Dj$G$9e(B.

e$B$3$l4V0c$$$G$7$?e(B. e$B0J2<$N$h$&$J46$8$K$J$kM=Dj$G$9e(B.

a = %w[banana banana durian orange orange orange]
a.inject_by(proc{|w| w}){|key, sum, value| sum += value}.each{|key,
sum| puts “#{key} #{sum}”}

__
---------------------------------------------------->> [email protected](B
e$B7=<ye(B <<—
---------------------------------->> e-mail: [email protected] <<—

In article [email protected],
[email protected] ([email protected]=<ye(B) writes:

e$B$"$k%0%k!<%W$KJ,$1$F=87W$7$?$$$J$ie(B, e$B2<5-$N$h$&$JJ}$,e(B Ruby e$B$]$$$+$be(B.

a = %w[banana banana durian orange orange orange]
a.group_by{|w| w}.each{|key, values| puts “#{key} #{values.size}”}

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group_by e$B$O;DG0$J$3$H$K$<$s$V%a%b%j$KFI$_9~$`$3$H$K$J$k$s$Ge(B
e$B$9$h$M!#e(B

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[ruby-dev:38392] e$B$+$i;O$^$k%9%l%C%I$G!"$A$g$C$H$[$C$?$i$+$7e(B
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e$B$J$C$F$$$^$9e(B. e$B$=$&$7$?>l9ge(B, Rubye$BN.$K=q$1$Pe(B:

a = %w[banana banana durian orange orange orange]
a.inject_by(proc{|w| w}){|key, values| puts “#{key} #{values.size}”}

e$B$N$h$&$J46$8$N5-=R$K$J$kM=Dj$G$9e(B.

[ruby-dev:38392] e$B$+$i$NDs0F$O$$$m$$$m$HJQA+$7$F$$$k$N$G$9$,!"e(B
e$B8=;[email protected]$G$N7ABV$Ne(B slice_by [email protected]$H<!$N$h$&$K=q$1$^$9!#e(B

a = %w[banana banana durian orange orange orange]
a.slice_by {|w| w }.each {|key, values| puts “#{key} #{values.size}” }

e$B$^$!!"e(Bvalues e$B$,Bg$-$/$J$k$H%a%b%[email protected]$G$OHa$7$$%1!<%9$,=P$Fe(B
e$B$/$k$+$bCN$l$^$;$s$,!#e(B

word = nil
n = 0

end
end

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e$B$?$H$($P!"31$5$s$NNc$r$A$g$C$HJQ$($F!"e(B

word1 docid1 linenum1
word1 docid1 linenum2
word1 docid2 linenum3
word1 docid2 linenum4
word2 docid1 linenum5
word2 docid1 linenum6
word2 docid2 linenum7
word2 docid2 linenum8

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each_word {|word|

word e$BC10L$N=87W$N=i4|2=e(B

each_docid {|docid|
# docid e$BC10L$N=87W$N=i4|2=e(B
each_linenum {|linenum|

}
# docid e$BC10L$N=87W$N=*N;e(B
}

word e$BC10L$N=87W$N=*N;e(B

}

e$B$G$b!"e(Beach_with_peek e$B$N$h$&$J%$%F%l!<%?$G$O$3$&$$$&B?=E%k!<e(B
e$B%W$O<B8=$G$-$^$;$s!#$*$=$i$/!#e(B

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e$B$9!#$=$N$h$&$K9M$($F%H!<%/%s$N<[email protected]$KAjEv$9$k$H$3$m$Ke(B
Enumerator#{peek,next} e$B$r;H$&$H!"$3$l$O<B8=$G$-$^$9!#e(B

e$B$J$<FbIt%$%F%l!<%?$G$J$/!"30It%$%F%l!<%?$r3HD%$7$F$$$k$N$+!“e(B
e$B$H$$$&M}M3$O$3$3$K$”$j$^$9!#e(B

e$B$1$$$8$e!w$$$7$D$+$G$9e(B.

In [ruby-dev:38935] the message: “[ruby-dev:38935] Re:
Enumerator#peek”, on Jul/29 00:29(JST) Tanaka A. writes:

e$B$"$k%0%k!<%W$KJ,$1$F=87W$7$?$$$J$ie(B, e$B2<5-$N$h$&$JJ}$,e(B Ruby e$B$]$$$+$be(B.
a = %w[banana banana durian orange orange orange]
a.group_by{|w| w}.each{|key, values| puts “#{key} #{values.size}”}
MapReducee$B7O$G$O>e5-$N$h$&$J46$8$G=q$/$3$H$,B?$$$H;W$$$^$9e(B.

group_by e$B$O;DG0$J$3$H$K$<$s$V%a%b%j$KFI$_9~$`$3$H$K$J$k$s$Ge(B
e$B$9$h$M!#e(B

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e$B%=!<%H$5$l$F$J$$>uBV$Ne(B
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e$BCN$l$^$;$se(B.

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e$B%=%C%I$bEvA3$"[email protected]$F!"$=$l$O$=$l$G9M$($F$$$^$9!#e(B
[ruby-dev:38392] e$B$+$i;O$^$k%9%l%C%I$G!"$A$g$C$H$[$C$?$i$+$7e(B
e$B$K$7$F$$$k$N$G$9$,!“K:$l$F$$$k$o$1$G$O$”$j$^$;$s!#e(B

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a = %w[banana banana durian orange orange orange]
a.slice_by {|w| w }.each {|key, values| puts “#{key} #{values.size}”
}

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e$B$/$k$+$bCN$l$^$;$s$,!#e(B

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Enumerator#{peek,next} e$B$r;H$&$H!"$3$l$O<B8=$G$-$^$9!#e(B

e$B$?$7$+$Ke(B. [email protected](B:

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peeke$B$G=PMh$k$3$H$,e(B,
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e$B$^$;$s$,e(B, slice_bye$B$$?$$$J$b$N$NJ}$,9%$[email protected]$J$!e(B.

__
---------------------------------------------------->> [email protected](B
e$B7=<ye(B <<—
---------------------------------->> e-mail: [email protected] <<—

In article [email protected],
[email protected] ([email protected]=<ye(B) writes:

[email protected](B, e$B%=!<%H:Q$_$rA0Ds$H$7$J$$$G=hM}$G$-$k$N$Ge(B, e$B%=!<%H$5$l$F$J$$>uBV$Ne(B
e$B$b$N$r$o$6$o$6%=!<%H$7$F%3%s%H%m!<%k%V%l!<%/=hM}$9$k$N$HJQ$o$i$J$$$+$be(B
e$BCN$l$^$;$se(B.

e$B%a%=%C%I$N;EMM$H$7$F!"%=!<%H:Q$_$+$I$&$+$G7k2L$,JQ$o$i$J$/$Fe(B
e$B$o$+$j$d$9$$$N$ONI$$$G$9$h$M!#e(B

e$B$G$b!"%a%b%j$H$N%H%l!<%I%*%U$G!"%a%b%j>CHq$KBQ$($i$l$J$$$3$He(B
e$B$b$"$k$N$GMQES$K$h$C$F$O:$$j$^$9!#e(B

Ruby e$B$G$O!"%=!<%H:Q$$G$"$k$3$H$r%W%m%0%i%^$,CN$C$F$$$k>u67e(B
e$B$KBP$9$k;Y1g$O$+$J$j<jGv$G$9$h$M!#$?$^$KOC$K$"$,$ke(B bsearch
e$B$H$+!#%=!<%H:Q$
$NJ#?t$NJB$S$r%^!<%8$9$k$J$s$F$N$b$"$C$F$$$$e(B
e$B$h$&$J5$$,$7$^$9!#e(B
(COBOL e$B$G$O$3$l$r%^%C%A%s%0$H$$$&$i$7$$$N$G$9$,e(B)

[email protected]$C$F$$$k$H$3$m$,0c$&46$8$G$7$g$&$+!#e(B

e$B$&!<$se(B. Enumeratore$B$C$F$+$J$j1~MQE*$J%/%i%9e(B([email protected]@.$5$l$ke(B)
e$B$J$N$Ge(B, peeke$B$C$F$$$&$N$Oe(B, e$B$A$g$C$H0cOB46$,$"$k$+$be(B.

e$B$"!<!">l9g$K$b$h$k$s$G$9$,!“e(BIO e$B$de(B Array e$B$KBP$9$ke(B
Enumerator
e$B$,$=$N$h$&$J0UL#$G1~MQE*$G$”$k$H$$$&$N$O4V0c$C$F$$$k$H9M$($Fe(B
e$B$$$^$9!#e(BIO e$B$de(B Array
e$B$J$I$KBP$9$k30It%$%F%l!<%?$r<B8=$9$k$N$Oe(B
e$B4JC1$J$N$K!"e(BFiber e$B$r;H$&$N$OL5BL$,2a$.$^$9!#e(B

e$B$?$H$($P!"e(Benum = io.lines e$B$H$7$?$H$-$Ke(B enum.next
e$B$O!"7k6Ie(B
io.gets [email protected]$1$J$N$K!"e(BFiber
e$B$,;H$o$l$k$N$O$J$s$H$bL5BL$G$9!#e(B

e$B$b$7!"e(BEnumerator.external_iterator { … } e$B$H$$$&$h$&$J7A<0e(B
e$B$Ge(B enumerator e$B$,@8@.$G$-$F!“e(Bnext
e$B$O;XDj$7$?%V%m%C%/[email protected](B
e$B$1!”$H$$$&$N$,<B8=$G$-$l$P!"e(B(e$B;d$N9=A[$G$Oe(B next
[email protected]$_$N=he(B
e$BM}$b$7$^$9$,e(B) io.lines e$B$Oe(B
Enumerator.external_iterator { io.gets or raise StopIteration }
e$B$G<B8=$G$-$^$9!#e(B

IO, Array, Range e$BEy!“4pK\E*$J%/%i%9$Ne(B Enumerator e$B$O!”$A$g$Ce(B
e$B$H$,$s$P$C$F8zN($NNI$$30It%$%F%l!<%?$rDs6!$7$FNI$$$N$G$O$J$$e(B
e$B$+$H;W$C$F$$$^$9!#e(B

e$B%=!<%H$5$l$F$$$k$H$$$&A0Ds$G$G$9$Me(B. e$B$H$$$&$3$H$Oe(B, slice_bye$B$5$($"$l$Pe(B,
e$B%3%s%H%m!<%k%V%l!<%/=hM}$G$Oe(Bpeeke$B$OI,$:[email protected]$C$F$$$^$;$se(B?

e$B$3$NNc$G$O$=$&$G$9$M!#e(Bpeek e$B$,K\Ev$KM-8z$J$N$O$h$jJ#;($J%1!<e(B
e$B%9$G$9!#%3%s%H%m!<%k%V%l!<%/$G%V%l!<%/%-!<$,J#?t$"$k$H$+!#e(B

e$B=P$7$?Nc$,E,@Z$G$O$J$+$C$?$+$bCN$l$^$;$s!#e(B

e$B$^$!!"e(Bvalues e$B$,Bg$-$/$J$k$H%a%b%[email protected]$G$OHa$7$$%1!<%9$,=P$Fe(B
e$B$/$k$+$bCN$l$^$;$s$,!#e(B

e$B$?$7$+$Ke(B, fairye$B$G$be(Bgroup_bye$B$Ge(Bvaluese$B$rEO$9$N$O$I$&[email protected]$o$l$F$$$^$9e(B
(^^;;

e$B$=$&$$$($P!"e(B[ruby-dev:38934] e$B$N%3!<%I$Ge(B

| a = %w[banana banana durian orange orange orange]
| a.inject_by(proc{|w| w}){|key, sum, value| sum += value}.each{|key,sum| puts “#{key} #{sum}”}

e$B$H$$$&$N$O!"G[Ns$r:n$i$J$$$G:Q$`$H$$$&[email protected][email protected]$C$F$$$k$H;W$&$Ne(B
e$B$G$9$,!“e(Bsum += value e$B$H$$$&$H$3$m$,0UL#[email protected]$G$9!#%V%m%C%/JQe(B
e$B?t$Ne(B sum e$B$KBeF~$7$F$I$&[email protected]!”$H$+!“e(Bvalue
e$B$O$I$3$+$i=P$F$/e(B
e$B$k$N$+!”$H$+!#e(B

e$B;W$&$K!“J#?t$N%^%7%s$KJ,;6$5$;$F=hM}$r$d$m$&$H$$$&$J$i!“C18le(B
e$B?t$r?t$($k$H$-$NB-$7;;$N$h$&$Ke(B associative e$B$J1i;;$O!“e(B
associative e$B$G$”$k$3$H$rMxMQ$7$?;E3]$1$G$d$C$?$[$&$,$$$$$s$8$ce(B
e$B$J$$$+$J$!!”$H;W$$$^$9!#e(Bassociative e$B$G$”$l$P!"$D$^$j!“e(B
(a+b)+c=a+(b+c) e$B$N$h$&$J4X78$N1i;;$G$”$l$P!"3F%^%7%sFb$G8D!9e(B
e$B$K7k2L$r$^$H$a$i$l$^$9$+$i!#e(B

inject [email protected]$H!"@hF,$+$i=g$K$d$C$F$$$+$J$1$l$P$J$i$J$$46$8$,$7e(B
e$B$^$9!#$D$^$j!“e(Bassociative e$B$G$J$$1i;;$rM?$($F$h$$!”$H$$$&46$8e(B
e$B$,!#e(B

each_with_peeke$B$be(BEnumeratore$B$N$D$b$j$J$N$G30It%$%F%l!<%?$K$G$-$k$H9M$($Fe(B
e$B$$$^$9e(B. e$B$=$l$Ke(Bslice_bye$B$G$be(BEnumeratore$B$H$7$F07$($P<B8=2DG=$J5$$,$7$^$9$,e(B?

each_with_peek e$B$re(B Enumerator e$B$K$9$k$H$$$&$N$O!"$-$C$He(B Fiber
e$B$r;H$&$3$H$K$J$j$^$9$h$M!#$=$l$O7y$G$9!#$"$H!"e(Beach_with_peek
e$B$O:[email protected]$_$r$I$&$9$k$+$,LdBj$G$9$+$M!#e(Bnil e$B$H$9$ke(B
e$B$H!“e(Bnil e$B$H$$$&MWAG$,$”$C$?$H$-$H6hJL$G$-$^$;$s!#e(B

e$B$"$H!“e(Bslice_by
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peeke$B$G=PMh$k$3$H$,e(B, slice_bye$B$NMM$J$b$N$G$9$Y$F<B8=2DG=$G$O$J$$$+$bCN$le(B
e$B$^$;$s$,e(B, slice_bye$B$$?$$$J$b$N$NJ}$,9%$[email protected]$J$!e(B.

slice_by e$B$Oe(B slice_by e$B$G$$$$$s$8$c$J$$$G$7$g$&$+!#e(B
slice_by e$B$G4JC1$K$G$-$k$3$H$O!"e(Bslice_by e$B$G$d$k$[$&$,$$$$$H;We(B
e$B$$$^$9!#e(B

peek e$B$O!"$h$jDc5i$G$h$j1~MQHO0O$,9-$$$b$N$,[email protected]$$$G$9!#e(B

e$B%3%s%H%m!<%k%V%l!<%/$G%V%l!<%/%-!<$,J#?t$"$k$H$$$&$N$O!"7k9=e(B
e$B0lHLE*$_$?$$$G$9!#>pJs=hM}5;=Q<T;n83$K=P$F$/$k$[$I!#e(B

[email protected]$3$H$O$J$$$N$G3N$+$J$o$1$8$c$J$$$G$9$,!"!VFsCJ$N%3%s%He(B
e$B%m!<%k%V%l%$%/=hM}!W$J$I$HL<!$K$"$kK$b$"$k$h$&$G$9!#e(B
http://gihyo.jp/book/2002/4-7741-1607-6

peek e$B$O!"$=$&$$$&$H$3$m$r;Y1g$9$k%Y!<%9$K$J$k$b$N$G$9!#e(B

e$B$=$N$^$^;H$&$H$$$&$h$j$OItIJ$J$s$G$9$,!"@hFI$_$,I,MW$J$N$Oe(B
([email protected]$H9M$($k$He(B) e$B$+$J$j3N$+$J$N$G!"$^$:$=$3$r$D$1$k$N$Oe(B
e$B$I$&$+!"$H$$$&OC$G$9!#e(B

In article [email protected],
Urabe S. [email protected] writes:

[email protected]$+$i$NN`[email protected]$($Pe(BEnumerablee$B$Ke(Bungetce$B$N$h$&$J$b$N$,$"$l$P$$$$$s$8$c$J$$e(B
e$B$G$9$+$M$(!#e(B

[email protected]$N;W$$$D$-$J$N$G;[email protected]$G$9$,e(B

ungetc e$B$C$F!"[email protected]$b$N$H0c$&$b$N$rLa$;$?$j!“FI$_9~$^$Je(B
e$B$/$F$bLa$;$?$j!”%U%!%$%k=*C<$N07$$$,Fq$7$+$C$?$j!“7y$8$c$”$je(B
e$B$^$;$se(B?

e$B$I$&$;[email protected][email protected]$1$G!"$=$&$$$&7y$J$H$3$m$K$D$-$"$&M}e(B
e$BM3$O$J$$!"$H$$$&$N$,;d$NH=CG$G$9!#e(B

Tanaka A. e$B$5$s$O=q$-$^$7$?e(B:

e$B$=$N$^$^;H$&$H$$$&$h$j$OItIJ$J$s$G$9$,!"@hFI$_$,I,MW$J$N$Oe(B
([email protected]$H9M$($k$He(B) e$B$+$J$j3N$+$J$N$G!"$^$:$=$3$r$D$1$k$N$Oe(B
e$B$I$&$+!"$H$$$&OC$G$9!#e(B

[email protected]$+$i$NN`[email protected]$($Pe(BEnumerablee$B$Ke(Bungetce$B$N$h$&$J$b$N$,$"$l$P$$$$$s$8$c$J$$e(B
e$B$G$9$+$M$(!#e(B

[email protected]$N;W$$$D$-$J$N$G;[email protected]$G$9$,e(B

e$B$3$s$K$A$O%9%1!<%k%"%&%H$N;3:j$H?=$7$^$9!%e(B

Enumerator#peeke$BAjEv$N5!G=$K0lI<$G$9!%e(B

e$B%G!<%?%^%$%K%s%0$r9T$&>l9g!$;vA0$K?te(BGBe$B%/%i%9$N%=!<%H:Q$_$Ne(B
e$B%U%!%$%k$r$$$/$D$bMQ0U$7$F$*$$$F2<5-$G$$$&%3%s%H%m!<%k%V%l%$%/$re(B
e$B=hM}$rF10l%U%!%$%k$KBP$7$F2?EY$b9T$$$^$9!%e(B

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e$B$G$9$N$G!$>J%a%b%j$G$=$l$,C#@.$G$-$ke(BEnumerator#peeke$BAjEv$,$"$l$Pe(B
[email protected]$J$H;W$$$^$7$?!%e(B

On Thu, 30 Jul 2009 01:49:35 +0900

e$B$1$$$8$e!w$$$7$D$+$G$9e(B.

In [ruby-dev:38944] the message: “[ruby-dev:38944] Re:
Enumerator#peek”, on Jul/30 01:49(JST) Tanaka A. writes:

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e$B$?$H$($P!"e(Benum = io.lines e$B$H$7$?$H$-$Ke(B enum.next e$B$O!"7k6Ie(B
io.gets [email protected]$1$J$N$K!"e(BFiber e$B$,;H$o$l$k$N$O$J$s$H$bL5BL$G$9!#e(B

e$B$G$9$h$M$'e(B…

e$B$b$7!"e(BEnumerator.external_iterator { … } e$B$H$$$&$h$&$J7A<0e(B
e$B$Ge(B enumerator e$B$,@8@.$G$-$F!“e(Bnext e$B$O;XDj$7$?%V%m%C%/[email protected](B
e$B$1!”$H$$$&$N$,<B8=$G$-$l$P!"e(B(e$B;d$N9=A[$G$Oe(B next [email protected]$_$N=he(B
e$BM}$b$7$^$9$,e(B) io.lines e$B$Oe(B
Enumerator.external_iterator { io.gets or raise StopIteration }
e$B$G<B8=$G$-$^$9!#e(B

getse$B$H$+$J$ie(B, e$B$=$l$G9T$1$=$&$G$9$Me(B.

IO, Array, Range e$BEy!“4pK\E*$J%/%i%9$Ne(B Enumerator e$B$O!”$A$g$Ce(B
e$B$H$,$s$P$C$F8zN($NNI$$30It%$%F%l!<%?$rDs6!$7$FNI$$$N$G$O$J$$e(B
e$B$+$H;W$C$F$$$^$9!#e(B

Arraye$B$J$s$+$Oe(B, e$B>e5-$Ne(B Enumerator.external_iterator
e$B$_$?$$$Je(B, e$B$d$jJ}$Ge(B
e$B$O<B8=$G$-$=$&$b$J$$e(B(fibere$B;H$($PJL$G$9$,e(B(^^;;)e$B$N$GJLESBP=h$,I,MW$G$9$Me(B.

e$B$=$&$$$($P!"e(B[ruby-dev:38934] e$B$N%3!<%I$Ge(B

| a = %w[banana banana durian orange orange orange]
| a.inject_by(proc{|w| w}){|key, sum, value| sum += value}.each{|key,sum| puts “#{key} #{sum}”}

e$B$H$$$&$N$O!"G[Ns$r:n$i$J$$$G:Q$`$H$$$&[email protected][email protected]$C$F$$$k$H;W$&$Ne(B
e$B$G$9$,!“e(Bsum += value e$B$H$$$&$H$3$m$,0UL#[email protected]$G$9!#%V%m%C%/JQe(B
e$B?t$Ne(B sum e$B$KBeF~$7$F$I$&[email protected]!”$H$+!“e(Bvalue e$B$O$I$3$+$i=P$F$/e(B
e$B$k$N$+!”$H$+!#e(B

e$B$4$a$s$J$5$$e(B. e$B$3$N>l9g$Oe(B

a.inject_by(proc{|w| w}){|key, sum, value| sum += 1}.each{|key,sum| puts
“#{key} #{sum}”}

e$B$G$7$?e(B. e$B$3$N>l9ge(Bvaluee$B$K$Oe(B w e$B<+?H$,EO$k$N$G$9$,e(B.
e$B%o!<%[email protected]$1%+%&%s%H$9e(B
e$B$k$N$Ge(B1e$BB-$;$P$h$$$3$H$K$J$j$^$9e(B.

e$B;W$&$K!“J#?t$N%^%7%s$KJ,;6$5$;$F=hM}$r$d$m$&$H$$$&$J$i!“C18le(B
e$B?t$r?t$($k$H$-$NB-$7;;$N$h$&$Ke(B associative e$B$J1i;;$O!“e(B
associative e$B$G$”$k$3$H$rMxMQ$7$?;E3]$1$G$d$C$?$[$&$,$$$$$s$8$ce(B
e$B$J$$$+$J$!!”$H;W$$$^$9!#e(Bassociative e$B$G$”$l$P!"$D$^$j!“e(B
(a+b)+c=a+(b+c) e$B$N$h$&$J4X78$N1i;;$G$”$l$P!"3F%^%7%sFb$G8D!9e(B
e$B$K7k2L$r$^$H$a$i$l$^$9$+$i!#e(B

e$B<B:]$O$=$N$h$&$K=hM}$7$^$9e(B. e$B$^$:e(B,
e$B%m!<%+%k$Ge(Binject(reduce)e$B$7$Fe(B, e$B3F%N!<e(B
e$B%I$N$b$N$r$^$H$a$Fe(Binject(reduce)e$B$7$^$9e(B. e$B$G$9$N$Ge(B,
e$B7k9gN’$OA0Ds$K$J$C$Fe(B
e$B$$$^$9e(B.

inject [email protected]$H!"@hF,$+$i=g$K$d$C$F$$$+$J$1$l$P$J$i$J$$46$8$,$7e(B
e$B$^$9!#$D$^$j!“e(Bassociative e$B$G$J$$1i;;$rM?$($F$h$$!”$H$$$&46$8e(B
e$B$,!#e(B

e$B$"!<e(B. inject e$B$C$F$=$s$J%$%a!<%8$"$j$^$9e(B? e$B$$$A$*$&e(B,
reducee$B$H$$$&L>A0$be(B
aliase$B$7$F$$$^$9$,e(B,
Rubye$B$Ne(Binjecte$B$H;w$F$$$k$N$GF1$8L>A0$K$7$^$7$?e(B.

each_with_peek e$B$re(B Enumerator e$B$K$9$k$H$$$&$N$O!"$-$C$He(B Fiber
e$B$r;H$&$3$H$K$J$j$^$9$h$M!#$=$l$O7y$G$9!#e(B

e$B$=$l$Oe(B, e$BF10U$7$^$9e(B(^^;;;

e$B$"$H!"e(Beach_with_peek
e$B$O:[email protected]$_$r$I$&$9$k$+$,LdBj$G$9$+$M!#e(Bnil e$B$H$9$ke(B
e$B$H!“e(Bnil e$B$H$$$&MWAG$,$”$C$?$H$-$H6hJL$G$-$^$;$s!#e(B

e$B3N$+$Ke(B, e$B$=$l$O$"$C$Fe(B, e$BG[Ns$G<u$1$?>l9g$Oe(B,
e$BMWAG?t8:$i$9$N$+$J$!$H$+9M$(e(B
e$B$?$N$G$9$,e(B… e$B$"$^$j$-$l$$$K=hM}$G$-$J$$5$$,$7$F$$$^$9e(B.

e$B$"$H!“e(Bslice_by e$B$OG[Ns$K$7$A$c$$$^$9$+$i!”%a%b%[email protected]$G7y$G$9!#e(B

a = %w[banana banana durian orange orange orange]
a.slice_by {|w| w }.each {|key, values| puts “#{key} #{values.size}” }

e$B$Ne(B values e$B$N$3$H$G$9e(B?

slice_by e$B$Oe(B slice_by e$B$G$$$$$s$8$c$J$$$G$7$g$&$+!#e(B
slice_by e$B$G4JC1$K$G$-$k$3$H$O!"e(Bslice_by e$B$G$d$k$[$&$,$$$$$H;We(B
e$B$$$^$9!#e(B

peek e$B$O!"$h$jDc5i$G$h$j1~MQHO0O$,9-$$$b$N$,[email protected]$$$G$9!#e(B

e$BDc5i$J$N$OG’$a$^$9e(B(^^; e$B1~MQHO0O$O$^[email protected](B?e$B$G$9$,e(B…

e$B%3%s%H%m!<%k%V%l!<%/$G%V%l!<%/%-!<$,J#?t$"$k$H$$$&$N$O!"7k9=e(B
e$B0lHLE*$_$?$$$G$9!#>pJs=hM}5;=Q<T;n83$K=P$F$/$k$[$I!#e(B

[email protected]$3$H$O$J$$$N$G3N$+$J$o$1$8$c$J$$$G$9$,!"!VFsCJ$N%3%s%He(B
e$B%m!<%k%V%l%$%/=hM}!W$J$I$HL<!$K$"$kK$b$"$k$h$&$G$9!#e(B
http://gihyo.jp/book/2002/4-7741-1607-6

e$B$3$l$K4X$7$F$G$9$,e(B,

slice_bye$B$Ge(B
valuese$B$,Mh$?$i$=$l$r:#EY$OBhe(B2e$BMWAG$Ge(Bslice_bye$B$9$l$P$h$$$h$&$Je(B
e$B5$$,$7$^$9e(B.

a = [[word1 docid1 linenum1],
[word1 docid1 linenum2],…

a.slice_by{|l| l[0]}.each do |key, values|
values.slice_by{|l| l[1]}.each do |key1, values1|

2e$BCJ$N%3%s%H%m!<%k%V%l!<%/=hM}$r4*0c$$$7$F$$$J$1$l$P$G$9$,e(B.

[email protected]$+e(B,
slice_bye$B$O7k9=;H$($k$+$b$C$F5$$K$J$C$F$-$^$7$?e(B(^^;;;
e$BG[Ns$O$I$s$I$s=PMh$F$7$^$$$^$9$1$I$Me(B(^^;

peek e$B$O!"$=$&$$$&$H$3$m$r;Y1g$9$k%Y!<%9$K$J$k$b$N$G$9!#e(B

slice_bye$B$re(B Ruby(e$B$N%9%/%j%W%He(B)e$B$G<B8=$7$?$1$l$Pe(B
peeke$B$b$7$/$Oe(Bpeeke$B$HF1$8=he(B
e$BM}$,I,MW$K$J$j$^$9$Me(B. —(1)

e$B$=$N$^$^;H$&$H$$$&$h$j$OItIJ$J$s$G$9$,!"@hFI$_$,I,MW$J$N$Oe(B
([email protected]$H9M$($k$He(B) e$B$+$J$j3N$+$J$N$G!"$^$:$=$3$r$D$1$k$N$Oe(B
e$B$I$&$+!"$H$$$&OC$G$9!#e(B

e$B$?$7$+$Ke(B, (1)e$B$N$h$&$J$3$H$,<B8=$G$-$k$N$Ge(B peek
e$B$,$"$k$H$$$m$$$mJXMx$Je(B
e$B5$$,$7$F$-$^$7$?e(B.

e$B$=$l$Ke(B e$B<BAu$be(B,
e$B$3$l$K$h$C$F<B9T%3%9%H$,L$K8+$($FA}$($k$C$F$o$1$G$b$Je(B
e$B$$$G$9$7$Me(B.

__
---------------------------------------------------->> [email protected](B
e$B7=<ye(B <<—
---------------------------------->> e-mail: [email protected] <<—

In article [email protected],
[email protected] ([email protected]=<ye(B) writes:

fairye$B$G$Oe(B, e$BJ,;6%=!<%H$NFbIt=hM}$G%^!<%8%=!<%H$r;H$C$F$$$k$N$G$9$,e(B, e$B$=e(B
e$B$&$$$&$N$,$"$k$H$+$J$jJXMx$G$9e(B(^^;;

e$B%=!<%H:Q$_$N$rJ#?t%^!<%8$9$k$H$$$&$N$O!“FbIt%$%F%l!<%?$G$O$Ge(B
e$B$-$J$$$N$G!”$d$C$Q$j30It%$%F%l!<%?$r;H$&$3$H$K$J$j$^$9!#e(B

e$B$3$N>l9ge(B peek e$B$Oe(B…
e$B%^!<%8$NESCf$GCfCG$7$?$H$-$KMWAG$,>xH/$7e(B
e$B$F$7$^$o$J$$$h$&$K$9$k$N$KMxMQ$G$-$^$9$M!#$^$!!"$9$4$/Lr$KN)e(B
e$B$D$H$$$&$[$I$G$O$"$j$^$;$s$,!#e(B

e$B$"$H!“e(B2e$B8D$8$c$J$/$F0lHL$Ke(B
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[email protected]=g0L$D$-%-%e!<$,M_$7$$$G$9$h$M$’!#$J$s$GI8=`E:IU$5$l$F$$$Je(B
[email protected]$m$&!#e(B

e$B;d$b$=$&;W$C$F$$$^$9e(B. e$B$=$l$Ke(B, threade$B$r$^$?$2$J$$$N$Ge(B, e$BJ#?t%9%l%C%I$K$^e(B
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e$B$b$”$j$^$9$M!#e(B

IO, Array, Range e$BEy!“4pK\E*$J%/%i%9$Ne(B Enumerator e$B$O!”$A$g$Ce(B
e$B$H$,$s$P$C$F8zN($NNI$$30It%$%F%l!<%?$rDs6!$7$FNI$$$N$G$O$J$$e(B
e$B$+$H;W$C$F$$$^$9!#e(B

Arraye$B$J$s$+$Oe(B, e$B>e5-$Ne(B Enumerator.external_iterator e$B$_$?$$$Je(B, e$B$d$jJ}$Ge(B
e$B$O<B8=$G$-$=$&$b$J$$e(B(fibere$B;H$($PJL$G$9$,e(B(^^;;)e$B$N$GJLESBP=h$,I,MW$G$9$Me(B.

e$B$?$H$($PG[Ns$J$i!"e(B

i = -1
Enumerator.external_iterator {
i += 1
raise StopIteration if ary.length <= i
ary[i]
}

e$B$H$$$&$h$&$K$G$-$^$9!#e(B

e$B$^$!!“e(Brewind e$B$de(B marshal e$B$r$I$&$9$k$+$H$+!“e(Beach
[email protected]$i$Ie(B
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e$B$,!"$&$^$/$$$/%G%6%$%[email protected]$m$&!"$H;W$C$F$$$^$9!#e(B

e$B$K7k2L$r$^$H$a$i$l$^$9$+$i!#e(B

e$B<B:]$O$=$N$h$&$K=hM}$7$^$9e(B. e$B$^$:e(B, e$B%m!<%+%k$Ge(Binject(reduce)e$B$7$Fe(B, e$B3F%N!<e(B
e$B%I$N$b$N$r$^$H$a$Fe(Binject(reduce)e$B$7$^$9e(B. e$B$G$9$N$Ge(B, e$B7k9gN’$OA0Ds$K$J$C$Fe(B
e$B$$$^$9e(B.

e$B$(!<$H!"%V%m%C%/$NCf$re(B sum += 1 e$B$H$7$F$7$^$C$?$N$G!“e(B
inject_by e$B$O$=$&$O$G$-$J$/$J$C$F$$$k!”$H;W$&$s$G$9$,$I$&$G$7$ge(B
e$B$&!#e(B

sum += 1 e$B$H$$$&%V%m%C%/$r;H$C$Fe(B sum1 + sum2 e$B$H$$$&B-$7;;$r9Te(B
e$B$&$N$OL5M}$C$]$$$G$9$h$M!#e(B

e$B$"!<e(B. inject e$B$C$F$=$s$J%$%a!<%8$"$j$^$9e(B? e$B$$$A$*$&e(B, reducee$B$H$$$&L>A0$be(B
aliase$B$7$F$$$^$9$,e(B, Rubye$B$Ne(Binjecte$B$H;w$F$$$k$N$GF1$8L>A0$K$7$^$7$?e(B.

inject e$B$H$$$&L>A0$Oe(B Ruby e$B$G$7$+7P83$,$J$$$N$G!"JP$C$F$k$+$be(B
e$B$7$l$^$;$s!#e(B

e$B$"$H!“e(Bslice_by e$B$OG[Ns$K$7$A$c$$$^$9$+$i!”%a%b%[email protected]$G7y$G$9!#e(B

a = %w[banana banana durian orange orange orange]
a.slice_by {|w| w }.each {|key, values| puts “#{key} #{values.size}” }

e$B$Ne(B values e$B$N$3$H$G$9e(B?

e$B$O$$!#e(B

2e$BCJ$N%3%s%H%m!<%k%V%l!<%/=hM}$r4*0c$$$7$F$$$J$1$l$P$G$9$,e(B.

[email protected]$+e(B, slice_bye$B$O7k9=;H$($k$+$b$C$F5$$K$J$C$F$-$^$7$?e(B(^^;;;
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e$BG[Ns$r:n$C$F$7$^$C$FNI$1$l$P!"$G$-$^$9!#e(B

peek e$B$N0U?^$O!"$=$l$rHr$1$?$$$H$$$&OC$G$9!#e(B

slice_bye$B$re(B Ruby(e$B$N%9%/%j%W%He(B)e$B$G<B8=$7$?$1$l$Pe(B peeke$B$b$7$/$Oe(Bpeeke$B$HF1$8=he(B
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e$B$$$d!“e(Bslice_by e$B$OFbIt%$%F%l!<%?$G<BAu$7$^$9!#30It%$%F%l!<%?e(B
e$B$O;H$$$^$;$s$N$G!“e(Bpeek e$B$b;H$$$^$;$s!#FbIt%$%F%l!<%?$r;H$&$He(B
[email protected]$_$r9T$&e(B
(e$B$H$$$&$+!”=hM}$r0l=dCY1d$5$;$ke(B)e$B!”$H$$$&e(B
e$B0UL#$G$7$?$i$=$N$H$*$j$G$9$,!#e(B

e$B$^$D$b$He(B e$B$f$-$R$m$G$9e(B

In message “Re: [ruby-dev:38932] Enumerator#peek”
on Tue, 28 Jul 2009 18:45:00 +0900, Tanaka A. [email protected]invalid
writes:

|Enumerator#peek [email protected]_$9$k$N$O$I$&$G$7$g$&$+!#e(B

e$B$"$C$FNI$$$H;W$$$^$9!#e(B1.9.2e$B$KF~$l$F$h$$$+$Oe(BYuguie$B$5$s$N>5Bz$re(B
[email protected]$kI,MW$,$"$j$^$9$,!"$?$V$sNI$$$H$*$C$7$c$k$N$G$O$J$$$+$H!#e(B

In article [email protected],
Yukihiro M. [email protected] writes:

|Enumerator#peek [email protected]_$9$k$N$O$I$&$G$7$g$&$+!#e(B

e$B$"$C$FNI$$$H;W$$$^$9!#e(B1.9.2e$B$KF~$l$F$h$$$+$Oe(BYuguie$B$5$s$N>5Bz$re(B
[email protected]$kI,MW$,$"$j$^$9$,!"$?$V$sNI$$$H$*$C$7$c$k$N$G$O$J$$$+$H!#e(B

yugui e$B$5$s!"$I$&$G$7$g$&e(B?

e$B$1$$$8$e!w$$$7$D$+$G$9e(B.

In [ruby-dev:38973] the message: “[ruby-dev:38973] Re:
Enumerator#peek”, on Aug/01 01:54(JST) Tanaka A. writes:

e$B%=!<%H:Q$_$N$rJ#?t%^!<%8$9$k$H$$$&$N$O!“FbIt%$%F%l!<%?$G$O$Ge(B
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e$B$F$7$^$o$J$$$h$&$K$9$k$N$KMxMQ$G$-$^$9$M!#$^$!!"$9$4$/Lr$KN)e(B
e$B$D$H$$$&$[$I$G$O$"$j$^$;$s$,!#e(B

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[email protected]$m$&!#e(B

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}

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1.9e$B$Ne(BHashe$B$OFbIt$G=g=x$r0];}$7$F$$$k$+$i%$%s%G%C%/%9%"%/e(B
e$B%;%9$r5v$9$h$&$K$9$l$P2DG=$J5$$,$7$^$9$Me(B.

e$B$^$!!“e(Brewind e$B$de(B marshal e$B$r$I$&$9$k$+$H$+!“e(Beach [email protected]$i$Ie(B
e$B$&$9$k$+$H$+!”$”$^$j40A4$H$O$$$($J$$$N$b;v<B$G$O$"$k$N$G$9e(B
e$B$,!"$&$^$/$$$/%G%6%$%[email protected]$m$&!"$H;W$C$F$$$^$9!#e(B

e$B%$%s%G%C%/%9%"%/%;%92DG=$J$i$PBg>fIW$J5$$,$7$^$9e(B.
e$B$=$&$9$k$He(B,
e$B$+$J$j$Ne(BEnumerablee$B$JAH$9~$%/%i%9$N4X$7$F$Oe(BEnumeratore$B$K$Ge(B
e$B$-$=$&$G$9$Me(B.

a.inject_by(proc{|w| w}){|key, sum, value| sum += 1}.each{|key,sum| puts “#{key} #{sum}”}
e$B$(!<$H!"%V%m%C%/$NCf$re(B sum += 1 e$B$H$7$F$7$^$C$?$N$G!“e(B
inject_by e$B$O$=$&$O$G$-$J$/$J$C$F$$$k!”$H;W$&$s$G$9$,$I$&$G$7$ge(B
e$B$&!#e(B

sum += 1 e$B$H$$$&%V%m%C%/$r;H$C$Fe(B sum1 + sum2 e$B$H$$$&B-$7;;$r9Te(B
e$B$&$N$OL5M}$C$]$$$G$9$h$M!#e(B

e$B$J$+$J$+1T$$$G$9$Me(B(^^;;;
e$B$^$?4V0c$($F$7$^$$$^$7$?e(B. e$B$3$N>l9ge(B:

a.inject_by(proc{|w| w}){|key, sum, value| sum + 1}.each{|key,sum| puts
“#{key} #{sum}”}

e$B$G$7$?e(B. e$B$"e(B. e$B$G$be(B,
[email protected]$H7k9gN’@.$jN)$?$J$$$G$9$7e(B, e$B%0%k!<%WKh$N>.7W$He(B
e$B$+$b$H$l$J$$$s$G$9$Me(B… [email protected]$He(B, key,
valuee$B$N6hJL$,$J$$$N$G$9$,e(B,e$BAmOBe(B
e$B$r$H$C$?$j$9$k$K$Oe(Bvaluee$BIt$r<h$j=P$;$J$$$H$^$:$$$J$!e(B…
e$B$3$s$J46$8$K$Je(B
e$B$j$^$9$+e(B…

a.inject_by(proc{|w| w}, :value => proc{|w| 1}){|key, sum, value| sum +
value}.each{|key,sum| puts “#{key} #{sum}”}

e$B$"!<e(B. inject e$B$C$F$=$s$J%$%a!<%8$"$j$^$9e(B? e$B$$$A$*$&e(B, reducee$B$H$$$&L>A0$be(B
aliase$B$7$F$$$^$9$,e(B, Rubye$B$Ne(Binjecte$B$H;w$F$$$k$N$GF1$8L>A0$K$7$^$7$?e(B.

inject e$B$H$$$&L>A0$Oe(B Ruby e$B$G$7$+7P83$,$J$$$N$G!"JP$C$F$k$+$be(B
e$B$7$l$^$;$s!#e(B

inject e$B$C$Fe(B [email protected]$H;W$$$^$9$,e(B,
e$B?tCM$N$J$i$S$N4V$K1i;;e(B
e$B;R$rCf$K$$$l$k$C$F$H$3$m$+$iMh$F$$$k$N$+$J!)e(B e$B$H9M$($F$$$^$9e(B.
e$B$G$9$N$Ge(B,
e$B$=$l$K7k9gN’$rA0Ds$H$7$F$b$^$"$h$$$s$8$c$J$$$+$H9M$($?$o$1$G$9e(B.

[email protected]$+e(B, slice_bye$B$O7k9=;H$($k$+$b$C$F5$$K$J$C$F$-$^$7$?e(B(^^;;;
e$BG[Ns$O$I$s$I$s=PMh$F$7$^$$$^$9$1$I$Me(B(^^;
e$BG[Ns$r:n$C$F$7$^$C$FNI$1$l$P!"$G$-$^$9!#e(B

peek e$B$N0U?^$O!"$=$l$rHr$1$?$$$H$$$&OC$G$9!#e(B

e$B$J$k$[$Ie(B.

slice_bye$B$re(B Ruby(e$B$N%9%/%j%W%He(B)e$B$G<B8=$7$?$1$l$Pe(B peeke$B$b$7$/$Oe(Bpeeke$B$HF1$8=he(B
e$BM}$,I,MW$K$J$j$^$9$Me(B. —(1)

e$B$$$d!“e(Bslice_by e$B$OFbIt%$%F%l!<%?$G<BAu$7$^$9!#30It%$%F%l!<%?e(B
e$B$O;H$$$^$;$s$N$G!“e(Bpeek e$B$b;H$$$^$;$s!#FbIt%$%F%l!<%?$r;H$&$He(B
[email protected]$_$r9T$&e(B (e$B$H$$$&$+!”=hM}$r0l=dCY1d$5$;$ke(B)e$B!”$H$$$&e(B
e$B0UL#$G$7$?$i$=$N$H$*$j$G$9$,!#e(B

e$B$=$l$,e(B, e$B8eH>$Ne(Bpeeke$B$HF1$8=hM}$N0UL#$N$D$b$j$G$7$?e(B.

__
---------------------------------------------------->> [email protected](B
e$B7=<ye(B <<—
---------------------------------->> e-mail: [email protected] <<—

In article [email protected],
Tanaka A. [email protected] writes:

|Enumerator#peek [email protected]_$9$k$N$O$I$&$G$7$g$&$+!#e(B

e$B$"$C$FNI$$$H;W$$$^$9!#e(B1.9.2e$B$KF~$l$F$h$$$+$Oe(BYuguie$B$5$s$N>5Bz$re(B
[email protected]$kI,MW$,$"$j$^$9$,!"$?$V$sNI$$$H$*$C$7$c$k$N$G$O$J$$$+$H!#e(B

yugui e$B$5$s!"$I$&$G$7$g$&e(B?

e$B$7$P$i$/BT$C$F$$?$N$G$9$,!"H?1~$,$J$$$N$Ge(B trunk
e$B$KF~$l$F$
$^$7$?!#e(B
e$BLdBj$,$"$k$J$i$$$C$F$/[email protected]$5$$!#e(B

In article [email protected],
[email protected] ([email protected]=<ye(B) writes:

e$B$*!<e(B. e$B5$$,IU$+$J$+$C$?e(B…
e$B$“e(B, e$B$G$be(B, e$B$3$l$OG[Ns$,%$%s%G%C%/%9%”%/%;%[email protected]$+$i$G$9$Me(B. hashe$B$OL5M}e(B
e$B$+$be(B… e$B$G$be(B, 1.9e$B$Ne(BHashe$B$OFbIt$G=g=x$r0];}$7$F$$$k$+$i%$%s%G%C%/%9%"%/e(B
e$B%;%9$r5v$9$h$&$K$9$l$P2DG=$J5$$,$7$^$9$Me(B.

e$B$"$!!"e(BHash e$B$O9M$($F$^$;$s$G$7$?!#;H$&$+$J$!e(B?

e$B$G$7$?e(B. e$B$"e(B. e$B$G$be(B, [email protected]$H7k9gN’@.$jN)$?$J$$$G$9$7e(B, e$B%0%k!<%WKh$N>.7W$He(B
e$B$+$b$H$l$J$$$s$G$9$Me(B… [email protected]$He(B, key, valuee$B$N6hJL$,$J$$$N$G$9$,e(B,e$BAmOBe(B
e$B$r$H$C$?$j$9$k$K$Oe(Bvaluee$BIt$r<h$j=P$;$J$$$H$^$:$$$J$!e(B… e$B$3$s$J46$8$K$Je(B
e$B$j$^$9$+e(B…

a.inject_by(proc{|w| w}, :value => proc{|w| 1}){|key, sum, value| sum + value}.each{|key,sum| puts “#{key} #{sum}”}

e$B$1$C$-$g$/!"e(B

  • [email protected]$NMWAG$+$iJ,N`$N$?$a$NCM$KJQ49$9$k$b$Ne(B
  • [email protected]$NMWAG$+$iFs9`1i;;$KM?$($kCM$KJQ49$9$k$b$Ne(B
  • e$BFs9`1i;;e(B
    e$B$H$$$&e(B 3e$B$D$N4X?t$r;XDj$7$J$$$H$$$1$^$;$s$h$M!#e(B

Smalltalk e$B$J$i0z?t$H$7$F%V%m%C%/$rM?$($k$s$G$7$g$&$,!"e(BRuby
[email protected]$H$J$!!#e(Bgather_each e$B$G$be(B proc
e$B$r0z?t$KM?$($k$N$O7y$o$l$?$7!#e(B

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