var a, b, rest;
[a, b] = [1, 2];
console.log(a); // 1
console.log(b); // 2

[a, b, ...rest] = [1, 2, 3, 4, 5];
console.log(a); // 1
console.log(b); // 2
console.log(rest); // [3, 4, 5]

({ a, b } = { a: 1, b: 2 });
console.log(a); // 1
console.log(b); // 2

({ a, b, ...rest } = { a: 1, b: 2, c: 3, d: 4 });
console.log(a); // 1
console.log(b); // 2
console.log(rest); // { c:3, d:4 }

var foo = ["one", "two", "three"];

//  
var one = foo[0];
var two = foo[1];
var three = foo[2];

//  
var [one, two, three] = foo;

var a = 1;
var b = 3;

[a, b] = [b, a];

function f() {
  return [1, 2];
}

var a, b;
[a, b] = f();
console.log("A is " + a + " B is " + b);

var a = f();
console.log("A is " + a);

function f() {
  return [1, 2, 3];
}

var [a, , b] = f();
console.log("A is " + a + " B is " + b);

[, ,] = f();

var url = "https://developer.mozilla.org/en-US/Web/JavaScript";

var parsedURL = /^(\w+)\:\/\/([^\/]+)\/(.*)$/.exec(url);
var [, protocol, fullhost, fullpath] = parsedURL;

console.log(protocol); //  "https"

var o = { p: 42, q: true };
var { p, q } = o;

console.log(p); // 42
console.log(q); // true

//   
var { p: foo, q: bar } = o;

console.log(foo); // 42
console.log(bar); // true

const { Loader, main } = require("toolkit/loader");

var metadata = {
  title: "Scratchpad",
  translations: [
    {
      locale: "de",
      localization_tags: [],
      last_edit: "2014-04-14T08:43:37",
      url: "/de/docs/Tools/Scratchpad",
      title: "JavaScript-Umgebung",
    },
  ],
  url: "/ru/docs/Tools/Scratchpad",
};

var {
  title: englishTitle,
  translations: [{ title: localeTitle }],
} = metadata;

console.log(englishTitle); // "Scratchpad"
console.log(localeTitle); // "JavaScript-Umgebung"

var people = [
  {
    name: "Mike Smith",
    family: {
      mother: "Jane Smith",
      father: "Harry Smith",
      sister: "Samantha Smith",
    },
    age: 35,
  },
  {
    name: "Tom Jones",
    family: {
      mother: "Norah Jones",
      father: "Richard Jones",
      brother: "Howard Jones",
    },
    age: 25,
  },
];

for (var {
  name: n,
  family: { father: f },
} of people) {
  console.log("Name: " + n + ", Father: " + f);
}

// "Name: Mike Smith, Father: Harry Smith"
// "Name: Tom Jones, Father: Richard Jones"

function userId({ id }) {
  return id;
}

function whois({ displayName, fullName: { firstName: name } }) {
  console.log(displayName + " is " + name);
}

var user = {
  id: 42,
  displayName: "jdoe",
  fullName: {
    firstName: "John",
    lastName: "Doe",
  },
};

console.log("userId: " + userId(user)); // "userId: 42"
whois(user); // "jdoe is John"

let key = "z";
let { [key]: foo } = { z: "bar" };

console.log(foo); // "bar"