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Asked: 2026-05-22T17:58:03+00:00

According to Ruby Hash/Array documentation, the delete_if method returns an enumerator if no block

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According to Ruby Hash/Array documentation, the delete_if method returns an enumerator if no block is given. How is this useful? Can someone give an example to demonstrate this pattern?

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  1. Editorial Team

    The enumerator will just allow you to run the block later. For example, if you had a method that specifically handled the delete if for several different objects, you could pass it the enumerator.

    In the example below, it will print 1, 3, 5

    arr = [0,1,2,3,4,5]
enumerator = arr.delete_if
enumerator.each { |el| el.even? }
puts arr.join(', ')
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