Arrow Function

【Arrow Function】

一、Basic Syntax

　　

二、Advanced Syntax

　　

三、No binding of this

　　An arrow function does not create its own this context, so this has its original meaning from the enclosing context. Thus, the following code works as expected:

　　

　　without arrow fucntion, you have to write code like this:

　　

四、Invoked through call or apply

　　Since this is not bound in arrow functions, the methods call() or apply() can only pass in parameters. this is ignored.

　　

五、No binding of arguments

　　Arrow functions do not bind an arguments object. Thus, in this example, arguments is simply a reference to the same name in the enclosing scope:

　　

　　In most cases, using rest parameters is a good alternative to using an arguments object.

　　

六、Arrow functions used as methods，do not have this variable.

　　

七、cannot used with new statement

　　

八、do not have prototype property

　　　　

參考：https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/Arrow_functions