Method: Array#uniq_by!

Defined in:
lib/core/facets/array/uniq_by.rb

#uniq_by! ⇒ Object

Like #uniq, but determines uniqueness based on a given block.

a = (-5..5).to_a
a.uniq_by!{ |i| i*i }
a #=> [-5, -4, -3, -2, -1, 0]

As can be seen in the example, order is significant.



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# File 'lib/core/facets/array/uniq_by.rb', line 10

def uniq_by! #:yield:
  h = {}
  replace( inject([]){|a,x| h[yield(x)] ||= a << x} )
end