JS: Object Constructor

By Xah Lee. Date: . Last updated: .

The purpose of Object(…) is to convert a primitive value to a object.

[see JS: Primitive Value]

[see JS: Object Type]

Here's the full list of possible argument and their result:

// 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

ECMAScript 2015 §Fundamental Objects#sec-object-constructor

JS Object and Inheritance

  1. Object Overview
  2. Object Type
  3. Prototype and Inheritance
  4. Create Object
  5. Object Literal Expression
  6. Create Object with Parent X
  7. Get/Set Prototype
  8. Prevent Adding Property
  9. Determine Type of Object
  10. Clone Object
  11. Test Object Equality
  12. Add Method to Prototype
  13. Object Object
  14. Object.prototype
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