JavaScript: Object Constructor

By Xah Lee. Date: . Last updated: .

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 o1 = {};
const o2 = Object(o1);
console.log( o1 === o2); // 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

Object Literal Expression

Normally, you use literal expression to create object. [see Object Literal Expression]

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