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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 |