Flowdock
method

count

Importance_1
count(p1) public

Returns the number of elements. If an argument is given, counts the number of elements which equals to obj. If a block is given, counts the number of elements yielding a true value.

ary = [1, 2, 4, 2]
ary.count             #=> 4
ary.count(2)          #=> 2
ary.count{|x|x%2==0}  #=> 3
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