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29 lines
827 B
JavaScript
29 lines
827 B
JavaScript
import baseSum from './.internal/baseSum.js'
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/** Used as references for various `Number` constants. */
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const NAN = 0 / 0
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/**
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* This method is like `mean` except that it accepts `iteratee` which is
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* invoked for each element in `array` to generate the value to be averaged.
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* The iteratee is invoked with one argument: (value).
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*
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* @since 4.7.0
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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 mean.
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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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* meanBy(objects, ({ n }) => n)
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* // => 5
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*/
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function meanBy(array, iteratee) {
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const length = array == null ? 0 : array.length
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return length ? (baseSum(array, iteratee) / length) : NAN
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}
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export default meanBy
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