Review of Smart match for LT at Hatena on 2013/08/23.

1. ~~ in perl
id:astj

2. Ø|
m−oó$aw
=ê@b”Ì•
m−v−ߤo x

3. ž
$a = 3; @b = (1,2,3,4);
foreach $elem (@a) {
return 'Hit!' if $elem == $a;
}
«ł› ¾Í–ƒq
grep { $a == $_ } @b;

4. perl 5.10 ı “

5. ~~/æÄ

6. $a ~~ @b
@b”Ì•$awm− xÕþßç•þáÞ|—¡
use 5.010;
$a = 3; @b = (1,2,3,4);
print "Hit!n" if $a ~~ @b;

7. Õþßç ¡„

8. $a ~~ %c
îáÓ™”ô»Éß³¢—¡
use 5.010;
$a = "Steve"; %c = ( "Steve" => "Jobs", "Bill" => "Gates" );
print "Hit!n" if $a ~~ %c;

9. oo ¡„

10. m› ô¹ Õ Øq÷ö ¡
(Ø|v|¤œ5.14m¤ßvœvØ)
$a = 3; $b = (1,2,3,4);
print "Hit!n" if $a ~~ $b;
«¶Æ•5.14vœpush vpop vkeys vØ
ô¹ Õ −œ|o ¡„

11. $a ~~ $d
$a == $dºœ$a eq $dºœ
ø|¶•́°©—¡

12. ̂̂̂¶µvó^ ¡„

13. @a ~~ @b
$a = [1,2,3];
$b = [1,2,3];
print "Smart match!n" if $a ~~ $b; # match!
ž O
$p = [ 1, 2, 3 ];
$q = [ 1, 2, 3, 4 ];
print "Smart match!n" if $p ~~ $q; # matchしない!
$r = [ 1, 2, 3 ];
$s = [ 1, 2, [ 3, 4, 5 ] ];
print "Smart match!n" if $r ~~ $s; # matchするんだなぁ
µµ̇

14. perl 5.16”perldoc¢−
Right operand is an ARRAY:
Left Right Description and pseudocode
===============================================================
ARRAY1 ARRAY2 recurse on paired elements of ARRAY1 and ARRAY2[2]
like: (ARRAY1[0] ~~ ARRAY2[0])
&& (ARRAY1[1] ~~ ARRAY2[1]) && ...
HASH ARRAY any ARRAY elements exist as HASH keys
like: grep { exists HASH->{$_} } ARRAY
Regexp ARRAY any ARRAY elements pattern match Regexp
like: grep { /Regexp/ } ARRAY
undef ARRAY undef in ARRAY
like: grep { !defined } ARRAY
Any ARRAY smartmatch each ARRAY element[3]
like: grep { Any ~~ $_ } ARRAY

15. =êœÀ”~~“ oóÀ•~~|–−”
$a = [ 1, 2, 3 ];
$b = [ 1, 2, [ 3, 4, 5 ] ];
•u¦−($a ~~ $b) »fi—ß
( 1 ~~ 1 ) && ( 2 ~~ 2 ) && ( 3 ~ [3,4,5] ) # TRUE && TRUE && TRUE

16. ž O∼Œ¶z¶›–x¤

17. îáÓ™»
Left Right Description and pseudocode
===============================================================
HASH1 HASH2 all same keys in both HASHes
like: keys HASH1 ==
grep { exists HASH2->{$_} } keys HASH1
ARRAY HASH any ARRAY elements exist as HASH keys
like: grep { exists HASH->{$_} } ARRAY
Regexp HASH any HASH keys pattern match Regexp
like: grep { /Regexp/ } keys HASH
undef HASH always false (undef can''t be a key)
like: 0 == 1
Any HASH HASH key existence
like: exists HASH->{Any}

18. Keysm›–© Value»∙q Øooœ|o
$a = { "Steve" => "Jobs", "Bill" => "Gates" };
$b = { "Steve" => "Ballmer", "Bill" => "Gates" };
print "Smart match!n" if $a ~~ $b; # matchする!!

19. ∙µ∙µ |z¶›–x¤

20. H•Øo¬o¬ |z–ºº̃|z–

21. —ÞO•Øº }œ|o” ( id:moznion œ)
oÚ¹ô½ßèïáË: ̃©̌” Èo |¤

22. The smartmatch family of features
are now experimental

23. 5.18 g©¤" ‹O"¶)Ô•yß7—©
³°¶ozwooø„•¶›–|—o—|¤

24. ï

25. ǵ
C›̃”$a ~~ @b»ƒ©¶ß•oo ∼“ Êq
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ofiv¡›xß|–a›–z− ∼–
:ŸØgrep|–Ûe|—|łq

26. u|—o