How Does JavaScript's Object Bracket Notation Enable Destructuring Assignment?

Object Bracket Notation ({ Navigation } =) on the Left Side of Assignment

In JavaScript, the object bracket notation ({ Navigation } =) on the left side of an assignment is a syntax that allows for destructuring assignment. This feature, introduced in the ES2015 standard, enables the extraction of specific properties from an object into variables.

Object Destructuring

The object destructuring syntax allows the extraction of properties using the same syntax as object literal creation. For example, the following code assigns the p and q properties of an object o to the variables p and q:

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

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

You can also assign new variable names to the extracted properties:

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

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

Array Destructuring

Destructuring can also be applied to arrays, simplifying the assignment of individual elements to variables. Consider the following array foo:

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

Without destructuring, you would assign elements to variables as follows:

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

With destructuring, you can achieve the same result more concisely:

var [one, two, three] = foo;

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