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This channel is intended for people just starting with the Raku Programming Language (raku.org). Logs are available at irclogs.raku.org/raku-beginner/live.html Set by lizmat on 8 June 2022. |
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| deoac | $foo = '-s'; | 02:11 | |
| my @arr = < alice -bob cat -soup dog>; | |||
| How to I determine if any elements in @arr match $foo, without looping thru the array? | |||
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| pelevesque | andrewshitov.com/2019/09/09/check-...in-perl-6/ | 03:30 | |
| stackoverflow.com/questions/354230...rl-6-array | |||
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| deoac | But I need a partial match. '-s' isn't an element of the array. But an element contains it. | 05:14 | |
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| CIAvash | `@arr.any.&(*.contains: '-s')` | 06:02 | |
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| Nahita | or `@arr.grep(*.contains: $foo).so` | 07:25 | |
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| lizmat | m: say < alice -bob cat -soup dog>.contains('-s') | 09:11 | |
| camelia | Calling '.contains' on a List, did you mean 'needle (elem) list'? True in block <unit> at <tmp> line 1 |
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| lizmat | m: say quietly < alice -bob cat -soup dog>.contains('-s') | ||
| camelia | True | ||
| lizmat | though this *looks* like it is following the requirement to not loop through the array | 09:12 | |
| it actually does to create the Str representation | |||
| and it is actually the worst case always | |||
| m: say <alice -bob cat -soup dog>.first: *.contains('-s') | 09:13 | ||
| camelia | -soup | ||
| lizmat | m: say so <alice -bob cat -soup dog>.first: *.contains('-s') | ||
| camelia | True | ||
| lizmat | would be much better, as it would short-circuit as soon as it found it, so in this case, only look at 4 of the 5 elements in the list | ||
| ^^ deoac | 09:14 | ||
| oh, and it looks to me that the '-s' should be at the start of an element | 09:25 | ||
| if that is true, then this is better: | |||
| m: say so <alice -bob cat -soup dog>.first: *.starts-with('-s') | |||
| camelia | True | ||
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| deoac | Thank you lizmat. That's much better than my manual loop. | 13:17 | |
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