codenamev · October 9, 2013 14:57
diff --git a/array_sum.js.coffee b/array_sum.js.coffee
 # 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
	# 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