JS: Object Constructor

The purpose of Object(arg) is to convert a Primitive Value to a Object Type.

new Object(arg)

equivalent to Object(arg).

Object(value)

Return a object, by converting value to a object version of value. If value is aready of type object, it is returned.

Object()

Return a empty object. Same as {}.

Here is the full list of possible argument and their result:

• Object() → Return {}
• Object(null) → Return {}
• Object(undefined) → Return {}
• Object(boolean) → Return new Boolean(boolean)
• Object(number) → Return new Number(number)
• Object(string) → Return new String(string)
• Object(obj) → Return obj

// conversion of value to object

console.log( Object() ); // {}
console.log( Object(null) ); // {}
console.log( Object(undefined) ); // {}
console.log( Object(true) ); // [Boolean: true]
console.log( Object(3) );    // [Number: 3]
console.log( Object("x") );  // [String: 'x']
console.log( Object({}) ); // {}

When argument is already a object, that object itself is returned.

// Object(arg) returns arg itself if arg is a object type already

// object
const x1 = {};
const x2 = Object(x1);
console.log( x1 === x2); // true

// array
const a1 = [];
const a2 = Object(a1);
console.log( a1 === a2); // true

// function
const f1 = function () { };
const f2 = Object(f1);
console.log( f1 === f2); // true

// date
const d1 = new Date();
const d2 = Object(d1);
console.log( d1 === d2); // true