# String#each\_index $B$NDs0F(B

**URL:** <https://www.ruby-forum.com/t/string-each-index-b-nds0f-b/188828>\
**Category:** Development\
**Created:** [May 19, 2010, 2:02am UTC](https://www.ruby-forum.com/t/string-each-index-b-nds0f-b/188828 "2010-05-19T02:02:26Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![KISHIMOTOS\_Makoto](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/k/8baadc/32.png) [@KISHIMOTOS\_Makoto](https://www.ruby-forum.com/u/KISHIMOTOS_Makoto)\
**Post date:** [May 19, 2010, 2:02am UTC](https://www.ruby-forum.com/t/string-each-index-b-nds0f-b/188828/1 "2010-05-19T02:02:26Z")

</div>

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String#each\_indexe$B!J$He(B  
String#each\_byteindexe$B!K$H$$$&%a%=%C%I$rDs0F$7$^$9!#e(B  
Ruby e$B$G\<BAu$9$k$H0J2\<$N$h$&$J%a%=%C%I$G$9!#e(B

def each\_index  
unless block\_given? then  
Enumerator.new self, :each\_index  
else  
i = 0  
while i \< length do  
yield i  
i = i.succ  
end  
self  
end  
end

e$BNc$($P0J2\<$N$h$&$K;H$$$^$9!#e(B

def tr\_succ!  
each\_index{|i|  
self[i] = self[i].succ  
}  
end

e$BF1$8$3$H$Oe(B each\_char.with\_index{|c, i| …} e$B$G$G$-$^$9$,!“e(B  
e$B!J$I$&$;e(B c  
e$B$K%”%/%;%9$9$k$N$G$3$A$i$N$[$&$,M-MQ$+$b$7$l$^$;$s$,!Ke(B  
each\_index e$B$H=q$$$?$[$&$,!"C1=c$G0U?^$,L@3N$@$H;W$$$^$9!#e(B

---

<div class="post-metadata">

**Author:** ![KISHIMOTOS\_Makoto](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/k/8baadc/32.png) [@KISHIMOTOS\_Makoto](https://www.ruby-forum.com/u/KISHIMOTOS_Makoto)\
**Post date:** [May 19, 2010, 3:24am UTC](https://www.ruby-forum.com/t/string-each-index-b-nds0f-b/188828/2 "2010-05-19T03:24:23Z")

</div>

e$B@.@%$G$9!#e(B

(2010/05/19 9:02), KISHIMOTO, Makoto wrote:

> ```
> while i< length do
> 
> ```
> 
> each\_index{|i|  
> self[i] = self[i].succ  
> }  
> end
> 
> e$BF1$8$3$H$Oe(B each\_char.with\_index{|c, i| …} e$B$G$G$-$^$9$,!“e(B  
> e$B!J$I$&$;e(B c e$B$K%”%/%;%9$9$k$N$G$3$A$i$N$[$&$,M-MQ$+$b$7$l$^$;$s$,!Ke(B  
> each\_index e$B$H=q$$$?$[$&$,!"C1=c$G0U?^$,L@3N$@$H;W$$$^$9!#e(B

e$B$^$:!“HwK:$N$?$a$KDs0F$d%P%0Js9p$J$I!”%H%i%C%-%s%0$NI,MW$,$"$k$b$N$Oe(B  
Redmine e$B$Ne(B  
e$B%A%1%C%H$H$7$FD:$1$k$H$"$j$,$?$$$G$9!#e(B

e$B\<!$KDs0F\<+BN$G$9$,!"$3$NDs0F$Oe(B String#each  
e$B$r:o=|$7$?M}M3$KH?$7$^$9!#e(B  
(String e$B$Ne(B each e$BBP\>]$K$Oe(B line/character/codepoint/byte  
e$B$,$"$k$?$ae(B)  
(e$B$J$\*!“e(B1.8 e$B$G$Ne(B each e$BBP\>]$Oe(B line e$B$G$”$C$?e(B)

e$B$^$?!"F1$8$3$H$Oe(B str.chars.with\_index{|c, i| …}  
e$B$G$G$-$+$D$3$A$i$NJ}$,L@2w$G$9$7!"e(B  
String#each e$B$r:o=|$7$?$3$H$r9M$($l$P$3$A$i$NJ}$,e(B chars  
e$B$HL@\<($7$F$$$kJ,$h$$$H;W$$$^$9!#e(B

e$B$b$C$H8@$($P!"$3$N%f!\<%9%1!\<%9$N\>l9ge(B str.gsub(/./m){$&.succ}  
e$B$H$7$?J}$,9bB.$J$N$G$Oe(B  
e$B$J$$$+$H;W$$$^$9!#e(B

---

<div class="post-metadata">

**Author:** ![KISHIMOTOS\_Makoto](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/k/8baadc/32.png) [@KISHIMOTOS\_Makoto](https://www.ruby-forum.com/u/KISHIMOTOS_Makoto)\
**Post date:** [May 19, 2010, 4:55am UTC](https://www.ruby-forum.com/t/string-each-index-b-nds0f-b/188828/3 "2010-05-19T04:55:41Z")

</div>

e$B$-$7$b$H$G$9e(B

> e$B$^$:!“HwK:$N$?$a$KDs0F$d%P%0Js9p$J$I!”%H%i%C%-%s%0$NI,MW$,$"$k$b$N$Oe(B Redmine e$B$Ne(B  
> e$B%A%1%C%H$H$7$FD:$1$k$H$"$j$,$?$$$G$9!#e(B

e$B$o$+$j$^$7$?!#$^$:%a!\<%k$NH?1~$r8+$F$+$i!"$H$+;W$C$?$N$G$9$,!#e(B  
e$B\<!$+$ie(BMLe$BO"7H$Ge(Bredminee$B$K$bEPO?$5$l$k$h$&$K$7$^$9!#e(B

> e$B\<!$KDs0F\<+BN$G$9$,!"$3$NDs0F$Oe(B String#each e$B$r:o=|$7$?M}M3$KH?$7$^$9!#e(B  
> (String e$B$Ne(B each e$BBP\>]$K$Oe(B line/character/codepoint/byte e$B$,$"$k$?$ae(B)  
> (e$B$J$\*!“e(B1.8 e$B$G$Ne(B each e$BBP\>]$Oe(B line e$B$G$”$C$?e(B)

e$B$=$&$$$&$3$H$K$J$j$^$9$+e(B…e$B!#e(B[], []=  
e$B%a%=%C%I$H$N$D$J$,$j$Ge(BArraye$B$HF1$8$K$J$k$+$J$!!“e(B  
e$B$H$$$&$N$b$”$C$?$N$G$9$,!JA0$N%a!\<%k=q$$$?;~$KK:$l$F$$$?!K!"0l4S@-$Oe(BRubye$B$NL\I8$G$Oe(B  
e$B$J$$$s$G$7$?$M!#e(B

---

<div class="post-metadata">

**Author:** ![KISHIMOTOS\_Makoto](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/k/8baadc/32.png) [@KISHIMOTOS\_Makoto](https://www.ruby-forum.com/u/KISHIMOTOS_Makoto)\
**Post date:** [May 19, 2010, 6:24am UTC](https://www.ruby-forum.com/t/string-each-index-b-nds0f-b/188828/4 "2010-05-19T06:24:41Z")

</div>

e$B@.@%$G$9!#e(B

2010e$BG/e(B5e$B7ne(B19e$BF|e(B11:55 KISHIMOTO, Makoto  
[removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid):

> > e$B$^$:!“HwK:$N$?$a$KDs0F$d%P%0Js9p$J$I!”%H%i%C%-%s%0$NI,MW$,$“$k$b$N$Oe(B Redmine e$B$Ne(B  
> > e$B%A%1%C%H$H$7$FD:$1$k$H$”$j$,$?$$$G$9!#e(B
> 
> e$B$o$+$j$^$7$?!#$^$:%a!\<%k$NH?1~$r8+$F$+$i!"$H$+;W$C$?$N$G$9$,!#e(B  
> e$B\<!$+$ie(BMLe$BO"7H$Ge(Bredminee$B$K$bEPO?$5$l$k$h$&$K$7$^$9!#e(B

e$BESCf$G0\F0$9$k$H8e$G5DO@$,DI$$$E$i$/$J$k$N$G$9$h!#e(B

> > e$B\<!$KDs0F\<+BN$G$9$,!“$3$NDs0F$Oe(B String#each e$B$r:o=|$7$?M}M3$KH?$7$^$9!#e(B  
> > (String e$B$Ne(B each e$BBP\>]$K$Oe(B line/character/codepoint/byte e$B$,$”$k$?$ae(B)  
> > (e$B$J$\*!“e(B1.8 e$B$G$Ne(B each e$BBP\>]$Oe(B line e$B$G$”$C$?e(B)
> 
> e$B$=$&$$$&$3$H$K$J$j$^$9$+e(B…e$B!#e(B[], []= e$B%a%=%C%I$H$N$D$J$,$j$Ge(BArraye$B$HF1$8$K$J$k$+$J$!!“e(B  
> e$B$H$$$&$N$b$”$C$?$N$G$9$,!JA0$N%a!\<%k=q$$$?;~$KK:$l$F$$$?!K!"0l4S@-$Oe(BRubye$B$NL\I8$G$Oe(B  
> e$B$J$$$s$G$7$?$M!#e(B

e$B0l4S@-$K4X$7$F$O!V:GM%@h$G$O$J$$!W$G$9$M!#e(B  
e$B2?$+$rMWK\>$9$k:]$N:,5r$N0l$D$K0l4S@-$rF~$l$F$\*$/$3$H$OM-8z$G$O$"$j$^$9!#e(B

e$B$G!"0l4S@-$rMW5a$9$k$J$ie(B

- String#each e$B$re(B String#each\_char e$B$Ne(B alias e$B$H$7$FI|3he(B
- String e$B$re(B Enumerable e$B$K$7$J$\*$9e(B  
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