Keyword arguments

Ruby Development
#1

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redmine $B$N(B 2.0 tracker $B$K%A%1%C%H$rEPO?$7$?$N$G$9$,!"%a!<%k$,(B

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http://redmine.ruby-lang.org/issues/5454

$B%-!<%o!<%I0z?t$r<BAu$7$F$_$^$7$?!#(B

$ cat t.rb
def foo(str: “foo”, num: 424242)
p [str, num]
end
foo(str: “bar”)

$ ./ruby t.rb
[“bar”, 424242]

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  • $B;D$j$N%-!<%o!<%I0z?t$r<u$1<h$kJ}K!$,I,MW$+(B

    def foo(str: “foo”, num: 424242, **h)
    p h
    end
    foo(str: “bar”, check: true) #=> { :check => true }

  • nil $B$,EO$5$l$?$i$d$O$j(B nil $B$K$J$k$Y$-!)(B

    def foo(str: “foo”)
    p str
    end
    foo(str: nil) #=> nil ? ($B:#$O<jH4$-$G(B “foo”)

  • rest $B$J$7$GCN$i$J$$%-!<%o!<%I$,Mh$?$iNc30!&7Y9p$rH/$7$F(B
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    def foo(str: “foo”, num: 424242)
    end
    foo(check: true) #=> ArgumentError?

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  • $B0z?t$N=gHV$O$h$$$+(B

    def foo(
    a, b, c, # mandatory arguments
    opt = 1, # optional arguments
    *rest, # rest argument
    x, y, z, # post mandatory arguments
    k1: 1, k2:2, # keyword arguments
    **kh, # keyword rest argument
    &blk # block argument
    )

  • $BB>$$$m$$$m(B

#2

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In message “Re: [ruby-dev:44602] keyword arguments”
on Tue, 18 Oct 2011 01:36:58 +0900, Yusuke E. [email protected]
writes:

|$B%-!<%o!<%I0z?t$r<BAu$7$F$_$^$7$?!#(B

$B$"$j$,$H$&$4$6$$$^$9!#(B

| $ cat t.rb
| def foo(str: “foo”, num: 424242)
| p [str, num]
| end
| foo(str: “bar”)
|
| $ ./ruby t.rb
| [“bar”, 424242]
|
|$B:Y$+$$$3$H$O$^[email protected]$$K$7$F$$$^$;$s$,!"%-!<%o!<%I0z?t$,(B 2.0 $B$KF~$k(B
|$B$3$H$O$+$J$j3NDjE*$J$N$G!"$H$j$"$($:(B trunk $B$KF~$l$F9M$($k$H$$$&(B
|$B$N$O$I$&$G$7$g$&$+!#(B

$B;[email protected]$G$9!#(Btrunk$B$KF~$l$A$c$C$F$$$$$N$+$J!#$=$&$$$&5!G=$NF~$C(B
$B$F$$$J$$(B1.9$B%V%i%s%A$,M_$7$$?M$O5^[email protected]$C$?$[$&$,$$$$$H;W$$(B
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|$B0J2<$OL$<BAu!&7|0F$G$9!#(B
|
| - $B;D$j$N%-!<%o!<%I0z?t$r<u$1<h$kJ}K!$,I,MW$+(B
|
| def foo(str: “foo”, num: 424242, **h)
| p h
| end
| foo(str: “bar”, check: true) #=> { :check => true }

$B%a%=%C%I$N0>y$N$?$a$KI,[email protected]$H;W$$$^$9!#(B

| - nil $B$,EO$5$l$?$i$d$O$j(B nil $B$K$J$k$Y$-!)(B
|
| def foo(str: “foo”)
| p str
| end
| foo(str: nil) #=> nil ? ($B:#$O<jH4$-$G(B “foo”)

nil$B$K$J$k$Y$-$G$7$g$&!#(B

| - rest $B$J$7$GCN$i$J$$%-!<%o!<%I$,Mh$?$iNc30!&7Y9p$rH/$7$F(B
| $BM_$7$$!)(B
|
| def foo(str: “foo”, num: 424242)
| end
| foo(check: true) #=> ArgumentError?

[email protected]$NM>CO$,$"$k$H$3$m$G$9$M!#8=;[email protected]$G$O!"(B**$B$G<u$1<h$i(B
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| - $B0z?t$N=gHV$O$h$$$+(B
|
| def foo(
| a, b, c, # mandatory arguments
| opt = 1, # optional arguments
| *rest, # rest argument
| x, y, z, # post mandatory arguments
| k1: 1, k2:2, # keyword arguments
| **kh, # keyword rest argument
| &blk # block argument
| )

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