simple-utils-js/src/collection/averageBy.js

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/**
 * @description: 检查数组对象各项相等
 * @param {*} arr The array
 * @return {*} array
 */
const averageBy = (arr, fn) => arr.map(typeof fn === 'function' ? fn : val => val[fn]).reduce((acc, val) => acc + val, 0) / arr.length

module.exports = averageBy