js-function-lib/module/mean.js

JavaScript function library

"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
var isString_1 = __importDefault(require("./isString"));
var isFunction_1 = __importDefault(require("./isFunction"));
var sum_1 = __importDefault(require("./sum"));
/**
 * 计算 array 的平均值
 *
 * @param {Array<any>} array 要迭代的数组
 * @param {any} iteratee 调用每个元素的迭代函数
 * @returns {Function} 返回平均值
 * @version 1.1.9
 * @example
 *
 * mean([1, 2, 3]);
 * // => 2
 * const array = [{id: 1}, {id: 2}, {id: 3}];
 *
 * mean(array, 'id');
 * // => 2
 *
 * mean(array, (v) => v.id);
 * // => 2
 */
function mean(array, iteratee) {
    if (isString_1.default(iteratee)) {
        array = array.map(function (v) { return v[String(iteratee)]; });
    }
    else if (isFunction_1.default(iteratee)) {
        array = array.map(iteratee);
    }
    return sum_1.default(array) / array.length;
}
exports.default = mean;