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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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| jgaz | In an object method, I have `method foo ( Int --> Int ) { Int unless %table<<key>> }` expecting to have an uninitialized (Int) returned if the lookup fails otherwise I get the value. I get type Slip instead of an empty Int and yelled at if I attempt to say the output. How do I fix this? | 18:18 | |
| librasteve | jgaz: I have tried to reproduce your issue and, since it works for me, I guess that somehow you have set %table<<key>> to something True... | 18:35 | |
| jgaz | ok | ||
| librasteve | class A { my %table = %(key => 0); method foo ( Int --> Int ) { Int unless %table<key> } } say A.new.foo: 7; #(Int) | 18:36 | |
| jgaz | okay then, I must be doing something wrong. | 18:43 | |
| librasteve | sounds like my process - wrong, wrong ... wrong, right | 18:45 | |
| ;-) | |||
| jgaz | mine is more like wrong, wrong, right... make sure it works, make it look pretty. | 18:48 | |
| :) | |||
| nemokosch | Yeah you return Empty if the lookup succeeds | 18:54 | |
| jgaz | nemokosch, that's what I was seeing. I stopped trying to be clever and just did an `if <lookup> { return lookup } else { Int };`. I'm not proud of it, but it works. | 19:01 | |
| nemokosch | Or you could use an operator of your choice | 19:09 | |
| ||, or, // | |||
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| jgaz | nemokosch, I'll have to try that. | 20:40 | |
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| gfldex | m: my %h; my $c = ""; dd %h«$c»; dd %h{""}; | 22:50 | |
| camelia | () Any %h{''} = Any |
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| gfldex | jgaz: What is the value you where looking for that produced the Slip? | 22:53 | |
| jgaz: never mind. It's the unless on a True value that produces the Empty. | 22:57 | ||
| m: my %h = :2b; dd (%h«a» // Int); dd ( %h«b»); | 23:01 | ||
| camelia | Int Int %h = 2 |
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| gfldex | jgaz: ^^^ the defined-or operator does what you want. Unless you actually want a boolean test, then use ||. | 23:02 | |
| jgaz | gfldex, thanks! | ||
| What is the `dd` doing in this case? | 23:04 | ||
| gfldex | It's a baby DataDumper. | ||
| m: my Any:D %h = :2b; dd (%h«a» // Int); dd ( %h«b»); | |||
| camelia | Int Int %h = 2 |
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| gfldex | You may want to guard against undefined values in the Hash if you use //. Unless you got a guard on the values you store in the Hash elsewhere, ofc. | 23:05 | |
| jgaz | yeah, the guard is elsewhere. | 23:06 | |
| nemokosch | It may make sense to define all the entries typed | 23:07 | |
| my Int %table will always retrieve Int values | 23:08 | ||
| m: my Int %table; dd %table<a> | |||
| Raku eval | Int %table{'a'} = Int | ||
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