[ruby-trunk - Bug #8739][Open] Range#last と#last(n)で挙動の統一がされていない

Ruby Development
1

Issue #8739 has been reported by to_ueda (Tomoya Ueda).

Bug #8739: Range#last と#last(n)で挙動の統一がされていない

Author: to_ueda (Tomoya Ueda)
Status: Open
Priority: Normal
Assignee:
Category:
Target version:
ruby -v: ruby 2.1.0dev (2013-08-05) [x86_64-linux]
Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN

Range#lastは終端を返しますが、#last(n)は最後の要素を返します。
引数の有無で挙動が異なるのは意図したものでしょうか？
意図したものであれば、返す値を終端か要素どちらかに挙動を統一出来ないでしょうか。

#終端が返る
(1…5).last => 5
#最後の要素が返る
(1…5).last(1) => [4]

2

Issue #8739 has been updated by matz (Yukihiro M.).

Status changed from Rejected to Closed

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Matz.

Bug #8739: Range#last $B$H(B#last(n)$B$G5sF0$NE}0l$,$5$l$F$$$J$$(B

Author: to_ueda (Tomoya Ueda)
Status: Closed
Priority: Normal
Assignee: matz (Yukihiro M.)
Category:
Target version:
ruby -v: ruby 2.1.0dev (2013-08-05) [x86_64-linux]
Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN

Range#last$B$O=*C<$rJV$7$^$9$,!“(B#last(n)$B$O:G8e$NMWAG$rJV$7$^$9!#(B
$B0z?t$NM-L5$G5sF0$,0[$J$k$N$O0U?^$7$?$b$N$G$7$g$&$+!)(B
$B0U?^$7$?$b$N$G$”$l$P!"JV$9CM$r=*C<$+MWAG$I$A$i$+$K5sF0$rE}0l=PMh$J$$$G$7$g$&$+!#(B

#$B=*C<$,JV$k(B
(1…5).last$B!!(B=> 5
#$B:G8e$NMWAG$,JV$k(B
(1…5).last(1)$B!!(B=> [4]

3

Issue #8739 has been updated by naruse (Yui NARUSE).

Status changed from Closed to Assigned
Assignee changed from matz (Yukihiro M.) to nobu (Nobuyoshi
Nakada)
Target version set to current: 2.1.0

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$B$“$H!”(Brdoc $B$b$A$c$s$HDI=>$5$;$F2<$5$$!#(B

Bug #8739: Range#last $B$H(B#last(n)$B$G5sF0$NE}0l$,$5$l$F$$$J$$(B

Author: to_ueda (Tomoya Ueda)
Status: Assigned
Priority: Normal
Assignee: nobu (Nobuyoshi N.)
Category:
Target version: current: 2.1.0
ruby -v: ruby 2.1.0dev (2013-08-05) [x86_64-linux]
Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN

Range#last$B$O=*C<$rJV$7$^$9$,!“(B#last(n)$B$O:G8e$NMWAG$rJV$7$^$9!#(B
$B0z?t$NM-L5$G5sF0$,0[$J$k$N$O0U?^$7$?$b$N$G$7$g$&$+!)(B
$B0U?^$7$?$b$N$G$”$l$P!"JV$9CM$r=*C<$+MWAG$I$A$i$+$K5sF0$rE}0l=PMh$J$$$G$7$g$&$+!#(B

#$B=*C<$,JV$k(B
(1…5).last$B!!(B=> 5
#$B:G8e$NMWAG$,JV$k(B
(1…5).last(1)$B!!(B=> [4]

4

Issue #8739 has been updated by naruse (Yui NARUSE).

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http://c64b.rubyci.org/~chkbuild/ruby-trunk/log/20130806T090301Z.diff.html.gz

$B:GDc$G$b0\9TA<CVI,MW$8$c$J$$$G$9$+$M$'!#(B

Bug #8739: Range#last $B$H(B#last(n)$B$G5sF0$NE}0l$,$5$l$F$$$J$$(B

Author: to_ueda (Tomoya Ueda)
Status: Assigned
Priority: Normal
Assignee: nobu (Nobuyoshi N.)
Category:
Target version: current: 2.1.0
ruby -v: ruby 2.1.0dev (2013-08-05) [x86_64-linux]
Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN

Range#last$B$O=*C<$rJV$7$^$9$,!“(B#last(n)$B$O:G8e$NMWAG$rJV$7$^$9!#(B
$B0z?t$NM-L5$G5sF0$,0[$J$k$N$O0U?^$7$?$b$N$G$7$g$&$+!)(B
$B0U?^$7$?$b$N$G$”$l$P!"JV$9CM$r=*C<$+MWAG$I$A$i$+$K5sF0$rE}0l=PMh$J$$$G$7$g$&$+!#(B

#$B=*C<$,JV$k(B
(1…5).last$B!!(B=> 5
#$B:G8e$NMWAG$,JV$k(B
(1…5).last(1)$B!!(B=> [4]

5

Issue #8739 has been updated by kosaki (Motohiro KOSAKI).

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Bug #8739: Range#last $B$H(B#last(n)$B$G5sF0$NE}0l$,$5$l$F$$$J$$(B

Author: to_ueda (Tomoya Ueda)
Status: Assigned
Priority: Normal
Assignee: nobu (Nobuyoshi N.)
Category:
Target version: current: 2.1.0
ruby -v: ruby 2.1.0dev (2013-08-05) [x86_64-linux]
Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN

Range#last$B$O=*C<$rJV$7$^$9$,!“(B#last(n)$B$O:G8e$NMWAG$rJV$7$^$9!#(B
$B0z?t$NM-L5$G5sF0$,0[$J$k$N$O0U?^$7$?$b$N$G$7$g$&$+!)(B
$B0U?^$7$?$b$N$G$”$l$P!"JV$9CM$r=*C<$+MWAG$I$A$i$+$K5sF0$rE}0l=PMh$J$$$G$7$g$&$+!#(B

#$B=*C<$,JV$k(B
(1…5).last$B!!(B=> 5
#$B:G8e$NMWAG$,JV$k(B
(1…5).last(1)$B!!(B=> [4]

6

Issue #8739 has been updated by naruse (Yui NARUSE).

Priority changed from Normal to High

kosaki (Motohiro KOSAKI) wrote:

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$B<FED$5$sB&$G$N8+2r$bJ9$-$^$9$+$M!#(B

Bug #8739: Range#last $B$H(B#last(n)$B$G5sF0$NE}0l$,$5$l$F$$$J$$(B

Author: to_ueda (Tomoya Ueda)
Status: Assigned
Priority: High
Assignee: nobu (Nobuyoshi N.)
Category:
Target version: current: 2.1.0
ruby -v: ruby 2.1.0dev (2013-08-05) [x86_64-linux]
Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN

Range#last$B$O=*C<$rJV$7$^$9$,!“(B#last(n)$B$O:G8e$NMWAG$rJV$7$^$9!#(B
$B0z?t$NM-L5$G5sF0$,0[$J$k$N$O0U?^$7$?$b$N$G$7$g$&$+!)(B
$B0U?^$7$?$b$N$G$”$l$P!"JV$9CM$r=*C<$+MWAG$I$A$i$+$K5sF0$rE}0l=PMh$J$$$G$7$g$&$+!#(B

#$B=*C<$,JV$k(B
(1…5).last$B!!(B=> 5
#$B:G8e$NMWAG$,JV$k(B
(1…5).last(1)$B!!(B=> [4]

7

Issue #8739 has been updated by to_ueda (Tomoya Ueda).

$B%3%a%s%H$$$?$@$-$"$j$,$H$&$4$6$$$^$9!#(B

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$B$4H=CG$*4j$$CW$7$^$9!#(B

Bug #8739: Range#last $B$H(B#last(n)$B$G5sF0$NE}0l$,$5$l$F$$$J$$(B

Author: to_ueda (Tomoya Ueda)
Status: Assigned
Priority: High
Assignee: nobu (Nobuyoshi N.)
Category:
Target version: current: 2.1.0
ruby -v: ruby 2.1.0dev (2013-08-05) [x86_64-linux]
Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN

Range#last$B$O=*C<$rJV$7$^$9$,!“(B#last(n)$B$O:G8e$NMWAG$rJV$7$^$9!#(B
$B0z?t$NM-L5$G5sF0$,0[$J$k$N$O0U?^$7$?$b$N$G$7$g$&$+!)(B
$B0U?^$7$?$b$N$G$”$l$P!"JV$9CM$r=*C<$+MWAG$I$A$i$+$K5sF0$rE}0l=PMh$J$$$G$7$g$&$+!#(B

#$B=*C<$,JV$k(B
(1…5).last$B!!(B=> 5
#$B:G8e$NMWAG$,JV$k(B
(1…5).last(1)$B!!(B=> [4]

8

Issue #8739 has been updated by hsbt (Hiroshi SHIBATA).

$B8F$P$l$?$N$GJV;v$r$9$k$H!“(B2.1.0 $B$G(B warning $B=P$7$F(B 2.1.1
$B$GJQ$($k$+!”(B2.0.x $B$G(B warning $B=P$7$F(B 2.1
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Bug #8739: Range#last $B$H(B#last(n)$B$G5sF0$NE}0l$,$5$l$F$$$J$$(B

Author: to_ueda (Tomoya Ueda)
Status: Closed
Priority: High
Assignee: nobu (Nobuyoshi N.)
Category:
Target version: current: 2.1.0
ruby -v: ruby 2.1.0dev (2013-08-05) [x86_64-linux]
Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN

Range#last$B$O=*C<$rJV$7$^$9$,!“(B#last(n)$B$O:G8e$NMWAG$rJV$7$^$9!#(B
$B0z?t$NM-L5$G5sF0$,0[$J$k$N$O0U?^$7$?$b$N$G$7$g$&$+!)(B
$B0U?^$7$?$b$N$G$”$l$P!"JV$9CM$r=*C<$+MWAG$I$A$i$+$K5sF0$rE}0l=PMh$J$$$G$7$g$&$+!#(B

#$B=*C<$,JV$k(B
(1…5).last$B!!(B=> 5
#$B:G8e$NMWAG$,JV$k(B
(1…5).last(1)$B!!(B=> [4]

9

Issue #8739 has been updated by nobu (Nobuyoshi N.).

Reject$B$5$l$F$$$k$N5$$E$+$:!“$&$C$+$jJQ99$7$F$7$^$$$^$7$?$,!”(Brevert$B$7$^$9$+$M$'!#(B
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$B$d$C$Q$j(Brevert$B$+$J!#(B

Bug #8739: Range#last $B$H(B#last(n)$B$G5sF0$NE}0l$,$5$l$F$$$J$$(B

Author: to_ueda (Tomoya Ueda)
Status: Assigned
Priority: High
Assignee: nobu (Nobuyoshi N.)
Category:
Target version: current: 2.1.0
ruby -v: ruby 2.1.0dev (2013-08-05) [x86_64-linux]
Backport: 1.9.3: UNKNOWN, 2.0.0: UNKNOWN

Range#last$B$O=*C<$rJV$7$^$9$,!“(B#last(n)$B$O:G8e$NMWAG$rJV$7$^$9!#(B
$B0z?t$NM-L5$G5sF0$,0[$J$k$N$O0U?^$7$?$b$N$G$7$g$&$+!)(B
$B0U?^$7$?$b$N$G$”$l$P!"JV$9CM$r=*C<$+MWAG$I$A$i$+$K5sF0$rE}0l=PMh$J$$$G$7$g$&$+!#(B

#$B=*C<$,JV$k(B
(1…5).last$B!!(B=> 5
#$B:G8e$NMWAG$,JV$k(B
(1…5).last(1)$B!!(B=> [4]