Destructuring assignment ES6 strings, numbers, Boolean values, function parameters

const str="hello world";
const [a,b,...oth]=str;

 

 

String array is divided into three methods:

const str="hello world";
const [...str1]=str;
const str2=[...str];
const str3=str.split("");

 

 

Properties and methods of extraction string:

const str="hello world";
const {length,split}=str;

 

 

 Boolean value and deconstruction of assignment:

When numerical or Boolean in assignment, it will turn into object to be wrapped

const {valueOf}=1;
const {toString}=true;

//取别名
const {valueOf:vo}=1;
const {toString:ts}=true;

 

 

Deconstruction assignment function parameters:

function swap([a,b]){
    return [b,a];
}
let arr=[1,2];
arr=swap(arr);

 

 

function getInfo({
    name,
    age,
    friend1="cyy1",
    friend2="cyy2"
}){
    console.log(name);
    console.log(age);
    console.log(friend1);
    console.log(friend2);
}

//无序传入参数
var obj={
    age:18,
    name:"cyy"    
}
getInfo(obj);