The use of the ES6 variable to deconstruct the assignment

The following is sorted out from the Nanyi of "ECMAScript 6 ," chapter III the use of the assignment of the value of the deconstruction of the variables array

Let [A, B, c] = [1, 2, 3];
let [foo = true] = [];

Object

Let {foo, bar} = {foo: "AAA", Bar: "BBB"};
let {Foo:baz} = {foo: ' aaa ', bar: ' BBB '};

String

const [A, B, C, D, e] = ' Hello ';

Function

function Add ([x, Y]) {return
    x + y;
}
Add ([1, 2]); 3

[[1, 2], [3, 4]].map ([A, b]) => A + B);

function Move ({x = 0, y = 0} = {}) {return
    [x, y];
}
Move ({x:3, y:8}); [3, 8]

The purpose of the deconstruction assignmentValue of the Exchange variable

Let x = 1;
Let y = 2;
[x, Y] = [y, x];

Returning multiple values from a function

function Example () {return
    [1, 2, 3];
}
Let [A, B, c] = example ();

Function app () {return
    {
        foo:1,
        bar:2
    };
}
Let {foo, bar} = App ();

Definition of function parameters

function f ([x, Y, z]) {...}
f ([1, 2, 3]);

function g ({x, y, z}) {...}
G ({z:3, y:2, x:1});

Extract JSON data

Let Jsondata = {
    id:42,
    status: ' OK ',
    data: [867, 5309]
};
Let {ID, status, data:number} = Jsondata;

Default values for function arguments

Jquery.ajax = function (URL, {
    async = true,
    beforesend = function () {},
    cache = True,
    complete = funct Ion () {},
    Crossdomain = False,
    global = True,
    //... more config
}) {
    //... do stuff
};

Traversing the map structure

var map = new map ();
Map.set (' A ', ' hello ');
Map.set (' Second ', ' World ');

for (let [key, value] of map) {
    Console.log (key + ' is ' + value);
}
for (let [key] of map) {
    console.log (key);
}
for (let [, value] of map) {
    Console.log (value);
}

Input module's specified method

const {Sourceconsumer, Sourcenode} = require (' Source-map ');

The above content is sorted out from the Nanyi "ECMAScript 6 Getting Started" the third chapter variable's deconstruction assignment