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24 lines
545 B
JavaScript
24 lines
545 B
JavaScript
/**
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* The base implementation of `sum` and `sumBy`.
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*
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* @private
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* @param {Array} array The array to iterate over.
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* @param {Function} iteratee The function invoked per iteration.
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* @returns {number} Returns the sum.
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*/
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function baseSum(array, iteratee) {
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let result
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let index = -1
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const { length } = array
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while (++index < length) {
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const current = iteratee(array[index])
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if (current !== undefined) {
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result = result === undefined ? current : (result + current)
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}
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}
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return result
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}
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export default baseSum
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