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[ES6] 07. Default Value for function param

2024-08-03 07:10:26   223人阅读

Normally, we can set default value for function param:

//Here use "Hello" as default paramvar receive =function(message="Hello", handle){    handler(message);}receive("Come", function(message){   console.log(message + ", "+ "John");});

 

What we can do is use function as a default param:

var receive =function(message="Hello", handler=function(message){    console.log(message + ", "+ "John");}){    handler(message);}receive("Come");  //Come, John

 

Then we can use => to refactor the code:

var receive =function(message="Hello", handler= message => console.log(message + ", "+ "John")){    handler(message);}receive("Go");  //Go, John

 

It will be crazy: (do not use this, cannot be understood)

let receive = (message="Hello", handler= message => console.log(message + ", "+ "John")) => handler(message)receive(); //Hello John

 

[ES6] 07. Default Value for function param


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