CODEWITHSUNDEEP
ruby
daremkd
daremkd

Reputation: 8424

Parallel assignment with Ruby

Say I have an array, [1,2,3,4] and want to use parallel assignment to assign a to 1 and b to 3. I figured I could do something like:

a, _, b, _ = [1,2,3,4]

or even omit the last _ and it will work but Ruby will produce warnings for this for unused variables. Is there some other way to do this? Is this way of using underscores recommended?

Upvotes: 2

Views: 164

Answers (2)

Jörg W Mittag
Jörg W Mittag

Reputation: 369458

There should not be any warning about unused variables, provided of course that you actually use a and b somewhere. Using _ in this way is recommended and idiomatic, and even officially supported by the interpreter in that it actually does not generate warnings for unused variables if the name of the variable is _ or starts with _.

Upvotes: 3

steenslag
steenslag

Reputation: 80065

The warning is about unused variables a and b, not about _. An alternative :

a, b = [1,2,3,4].values_at(0,2)

Upvotes: 2

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