method
uniq
uniq()
public
Returns a new array by removing duplicate values in self.
If a block is given, it will use the return value of the block for comparison.
It compares values using their #hash and #eql? methods for efficiency.
a = [ "a", "a", "b", "b", "c" ] a.uniq # => ["a", "b", "c"] b = [["student","sam"], ["student","george"], ["teacher","matz"]] b.uniq { |s| s.first } # => [["student", "sam"], ["teacher", "matz"]]
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bvida -
January 25, 2010
2 thanks
Vidmantas -
January 14, 2013 - (>= v1_8_6_287)
0 thanks
Pass a block
While this example is not so obvious on first look what the block passed does, here’s a small explanation:
when the block is passed to this function, the uniqueness is checked based on a value returned by that block.
For example if it’s array of objects with “user_id” method, then this would be:
tasks.uniq{|t| t.user_id } # returns only tasks with unique user_id