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27 lines
714 B
JavaScript
27 lines
714 B
JavaScript
import baseSum from './.internal/baseSum.js'
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/**
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* This method is like `sum` except that it accepts `iteratee` which is
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* invoked for each element in `array` to generate the value to be summed.
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* The iteratee is invoked with one argument: (value).
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*
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* @since 4.0.0
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* @category Math
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* @param {Array} array The array to iterate over.
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* @param {Function} iteratee The iteratee invoked per element.
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* @returns {number} Returns the sum.
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* @example
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*
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* const objects = [{ 'n': 4 }, { 'n': 2 }, { 'n': 8 }, { 'n': 6 }]
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*
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* sumBy(objects, ({ n }) => n)
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* // => 20
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*/
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function sumBy(array, iteratee) {
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return (array != null && array.length)
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? baseSum(array, iteratee)
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: 0
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}
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export default sumBy
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