method

sigma

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What's this?

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

Show source

# File lib/minitest/benchmark.rb, line 331
    def sigma enum, &block
      enum = enum.map(&block) if block
      enum.inject { |sum, n| sum + n }
    end

sigma

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