From: Tanaka Akira <akr@...17n.org>
Date: 2002-11-20T16:14:04+09:00
Subject: [ruby-dev:18858] Re: Enumerable#zip

In article <5.1.1.8.2.20021120155403.03c024c8@blade.nagaokaut.ac.jp>,
  Shin-ichiro HARA <sinara@blade.nagaokaut.ac.jp> writes:

> $B;d$b:G=i$=$N$h$&$K!"$D$^$j!V(Bx.transpose == [] $B$H$J$k(B x $B$OJ#?t$"$k$N$G(B 
> [].transpose $B$OITDj!W$H9M$($?$N$G$9$,!":#$A$g$C$H0c$C$F!"!V(B[] $B$=$N$b$N(B
> $B$,#2=EG[Ns$H$7$FITDj$G$"$k$N$G!"(B[].transpose $B$OITDj!W$H9M$($F$$$^$9!#(B

$B$J$k$[$I!#(B

> $B$=$l$J$i$J$k$Y$/Aa$a$K!"Nc30$K$9$l$P$$$$!"$H$$$&9M$($b$"$k$7!"(B
> (b || [[]] * n)[i].each $B$"$k$$$O!"(B(b[i] || []).each $B$_$?$$$K!"Nc30$NH/(B
> $B@8$r$J$k$Y$/<j7Z$K2!$5$($i$l$?J}$,3Z$H$$$&9M$($b$"$k$7!"!"!"$I$&$J$s$G(B
> $B$7$g$&$M!"$H$$$&7kO@!#(B(^^;

(i,j) $BMWAG$r<hF@$9$k$N$K!"(B

$BNc30(B: (a.transpose rescue [[]] * 7)[i][j]
nil:  (a.transpose || [[]] * 7)[i][j]
[]:   (a.transpose[i] || [])[j]

$B$N$I$N%3!<%I$K$J$k$+$H$$$&$3$H$G$9$M!#(B
(magic number 7 $B$O(B /etc/passwd $B$N%U%#!<%k%I?t$G$9(B)

$B$^$!!"(B[] $B$b$$$$$+$b!"$H$$$&5$J,$K$J$C$F$-$?$J$!!#(B
-- 
[$BEDCf(B $BE/(B][$B$?$J$+(B $B$"$-$i(B][Tanaka Akira]
$B!V$U$($m(B! $B$o$+$a$A$c$s:n@o$G$9$(C"=$B!W(B(Little Worker, $B7KM7@84](B)