使用JavaScript ES6箭头功能的即时功能

Question

有谁知道如何使用ES6箭头语法编写立即函数？

这是ES3 / 5的做法：

(function () {
   //...
}());

我尝试过以下操作但最后一行出现unexpected token错误。

(() => {
  //...
}());

您可以在此处测试：http://www.es6fiddle.net/hsb8bgu4/

Answer 1

来自Arrow functions examples，

(() => "foobar")() // returns "foobar" 

因此，函数调用运算符应该在外面。

(() => {
  //...
})();

示例：http://www.es6fiddle.net/hsb8s1sj/

Answer 2

以下是我的演示代码！

  

永远记住function_name + () === function_caller

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/* ES5 */

// normal function

function abc(){
    console.log(`Hello, ES5's function!`);
}
abc();

var abc = function xyz(){
    console.log(`Hello, ES5's function!`);
};
abc();

// named function

var abc = function xyz(){
    console.log(`Hello, ES5's function!`);
}();


// anonymous function
// 1
(function(){
    console.log(`Hello, ES5's IIFE!`);
})();

// 2
(function(){
    console.log(`Hello, ES5's IIFE!`);
}());

// 3

var abc = function(){
    console.log(`Hello, ES5's function!`);
}();


/* ES6 */

// named arrow function
const xyz = () => {
    console.log(`Hello, ES6's Arrow Function!`);
};
xyz();


const xyz = (() => {
    console.log(`Hello, ES6's Arrow Function!`);
})();


// Uncaught SyntaxError: Unexpected token (

/*
const xyz = (() => {
    console.log(`Hello, ES6's Arrow Function!`);
}());
*/

// anonymous arrow function
(() => {
    console.log(`Hello, ES6's Arrow Function!`);
})();

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Immediately-invoked function expression

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let x;

(x = () => {
  console.log(`ES6 ${typeof(x)}`);
})();

// ES6 function

// OR

(() => {
  console.log(`ES6 ${typeof(Symbol)}`);
})();

// ES6 function

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