箭头函数是否像命名函数一样进行了优化？

注意：不能完全确定这些是链接视频演示中讨论的模式比较。

在10000次迭代中，命名功能似乎在铬下的V8实现中完成最快。

Arrow function

在100000次迭代中，匿名函数在最短的时间内完成；

64.51ms

4902.01ms

    var len = Array.from({      length: 100000    })     // named function    function _named() {      console.profile("named function");      console.time("named function");      function resolver(resolve, reject) {        resolve("named function")      }      function done(data) {        console.log(data)      }      function complete() {        console.timeEnd("named function");        console.profileEnd();        return "named function complete"      }      function callback() {        return new Promise(resolver).then(done)      }      return Promise.all(len.map(callback)).then(complete);    }     // anonymous function    function _anonymous() {      console.profile("anonymous function");      console.time("anonymous function");      return Promise.all(len.map(function() {          return new Promise(function(resolve, reject) {   resolve("anonymous function") }) .then(function(data) {   console.log(data) })        }))        .then(function() {          console.timeEnd("anonymous function");          console.profileEnd();          return "anonymous function complete"        })    }     // arrow function    function _arrow() {      console.profile("arrow function");      console.time("arrow function");      return Promise.all(len.map(() => {          return new Promise((resolve, reject) =>   resolve("arrow function") ) .then((data) => {   console.log(data) })        }))        .then(() => {          console.timeEnd("arrow function");          console.profileEnd();          return "arrow function complete"        })    }    _named().then(_anonymous).then(_arrow)

jsfiddle https://jsfiddle.net/oj87s38t/