@moomfe/zenjs/src/1. Core/6. Math/$mean/index.js

ZenJS 是一个高性能的 JavaScript 工具库。

import defineValue from "../../../shared/util/defineValue";
import Math from "../../../shared/global/Math/index";
import slice from "../../../shared/global/Array/prototype/slice";
import { $add, $divide } from "../$add/index";


defineValue( Math, '$mean', function(){
  const count = slice.call( arguments ).reduce(( count, next ) => {
    return $add( count, next );
  });

  return $divide( count, arguments.length );
});