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import baseSum from './.internal/baseSum.js'
/**
* 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
* @category Math
* @param {Array} array The array to iterate over.
* @param {Function} iteratee The iteratee invoked per element.
* @returns {number} Returns the sum.
* @example
*
* const objects = [{ 'n': 4 }, { 'n': 2 }, { 'n': 8 }, { 'n': 6 }]
*
* sumBy(objects, ({ n }) => n)
* // => 20
*/
function sumBy(array, iteratee) {
return (array != null && array.length)
? baseSum(array, iteratee)
: 0
}
export default sumBy
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