delete_if() public

Deletes every element of self for which block evaluates to true.

a = [ "a", "b", "c" ]
a.delete_if {|x| x >= "b" }   #=> ["a"]
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November 9, 2010
10 thanks

NOT Equivalent to Array#reject!

@tadman is wrong. There is a difference and, trust me, it can bite:

1.9.2 > [1,2,3,4].delete_if {|x| x > 10}
 => [1, 2, 3, 4] 
1.9.2 > [1,2,3,4].reject! {|x| x > 10}
 => nil

That is, if reject! hasn’t rejected anything, it returns nil.

May 13, 2009
3 thanks

Equivalent to Array#reject!

This method is functionally identical to Array#reject!

November 14, 2012
0 thanks

What artemave said.

I’d remove my original note if I could, but I can’t see a way how.