_.sumBy(array, [iteratee=_.identity])
This method is like _.sum except that it accepts iteratee which is invoked for each element in array to generate the value to be summed. The iteratee is invoked with one argument: (value).
Since
4.0.0
Arguments
-
array(Array): The array to iterate over. -
[iteratee=_.identity](Function): The iteratee invoked per element.
Returns
(number): Returns the sum.
Example
1 2 3 4 5 6 7 8 | var objects = [{ 'n': 4 }, { 'n': 2 }, { 'n': 8 }, { 'n': 6 }]; _.sumBy(objects, function(o) { return o.n; });// => 20 // The `_.property` iteratee shorthand._.sumBy(objects, 'n');// => 20 |
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