Create new array of objects that have a specific property/attribute in ruby

Question

I have an array of objects with a boolean attribute:

[#<Animal id: 1, type: "narwhal", magical: false>, #<Animal id: 2, type: "unicorn", magical: true>]

How do I create a new array with only the objects where the boolean :magical? is true?

messanjah · Accepted Answer · 2015-04-15 05:46:39Z

2

Are you looking for Enumerable#select?

a = [#<Animal id: 1, type: "narwhal", magical: false>, #<Animal id: 2, type: "unicorn", magical: true>]
b = a.select(&:magical?)
b
=> [#<Animal id: 2, type: "unicorn", magical: true>]

answered Apr 15, 2015 at 5:46

messanjah

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2 Comments

spickermann Over a year ago

@CarySwoveland: I like it improves readability and makes it really obvious that it returns true/false not just a trueish or falseish value.

Cary Swoveland Over a year ago

@spickerman, that converts the method magical? to a proc, but we haven't been told about a method by that name. Am I missing something? I'll check back in the morning.

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