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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 |