Get first object of specific class from an array in Ruby

Question

So I have an array of active record objects.

I need to grab the first existing object in that array with a class of post, move it to a brand new array so that it no longer exists in the initial one.

What's the most optimal way to do this in Ruby?

What have you tried so far? I think this might be what you are looking for http://stackoverflow.com/questions/3893278/ruby-kind-of-vs-instance-of-vs-is-a — Eric Tobias, Mar 06 '13 at 07:37

score 2 · Accepted Answer · answered Mar 06 '13 at 07:37

2

new_array = [old_array.delete(old_array.detect { |object| object.is_a? Post })]

answered Mar 06 '13 at 07:37

Amit Kumar Gupta

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Yes! This works! How could I modify this so that it could check for multiple classes? So add it if it's one of many. – alt Mar 06 '13 at 07:40
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@JacksonGariety You can use `[String, OtherClass].include? object.class` – TimPetricola Mar 06 '13 at 07:43
@JacksonGariety: You could use [`Enumerable#any?`](http://ruby-doc.org/core-2.0/Enumerable.html#method-i-any-3F) if you wanted to stick to `is_a?`. – mu is too short Mar 06 '13 at 07:44
Any reason to use `.is_a?` over `.include?`? – alt Mar 06 '13 at 07:46

Get first object of specific class from an array in Ruby

1 Answers1