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).
_.sum
iteratee
array
Optional
The iteratee invoked per element.
Returns the sum.
var objects = [{ 'n': 4 }, { 'n': 2 }, { 'n': 8 }, { 'n': 6 }];_.sumBy(objects, function(o) { return o.n; });// => 20// using the `_.property` iteratee shorthand_.sumBy(objects, 'n');// => 20 Copy
var objects = [{ 'n': 4 }, { 'n': 2 }, { 'n': 8 }, { 'n': 6 }];_.sumBy(objects, function(o) { return o.n; });// => 20// using the `_.property` iteratee shorthand_.sumBy(objects, 'n');// => 20
This method is like
_.sumexcept that it acceptsiterateewhich is invoked for each element inarrayto generate the value to be summed. The iteratee is invoked with one argument: (value).