Flowdock
method

sigma

Importance_1
Ruby latest stable (v1_9_3_392) - 0 notes - Class: TestCase
sigma(enum, &block) public

Enumerates over enum mapping block if given, returning the sum of the result. Eg:

sigma([1, 2, 3])                # => 1 + 2 + 3 => 7
sigma([1, 2, 3]) { |n| n ** 2 } # => 1 + 4 + 9 => 14
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