Ruby-style sum method for Array

# USAGE: # given: # <div class="price" data-amount="1">$1.00</div> # <div class="price" data-amount="2">$2.00</div> # > $('.price').get().sum (price) -> $(price).data('amount') # > 3 Array::sum = (fn = (x) -> x) -> @reduce ((a, b) -> a + fn b), 0
Sums elements of an array in a similar fashion as Ruby's `Array#sum` method

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