JavaScript: Object.assign

By Xah Lee. Date: . Last updated: .

New in ES2015.

Object.assign ( target_obj, source_obj_1, source_obj_2, … )

Shallow copy the values of all of the enumerable own properties from source_obj_1, source_obj_2 etc objects to a target_obj object.

Returns the modified target_obj.

target_obj is modified.

var A = {a1: 3};
var B = {b1: 3};
var T = {};

// add properties form A and B to T. Returns the new T
console.log ( Object.assign ( T, A, B ) ); // { a1: 3, b1: 3 }

// value of variable T is changed
console.log ( T ); // { a1: 3, b1: 3 }

Reference

ECMAScript® 2016 Language Specification#sec-object.assign

Object and Inheritance Topic

  1. JavaScript: Object System Overview
  2. JavaScript: What's Object?
  3. JavaScript: Prototype and Inheritance
  4. JavaScript: Create Object
  5. JavaScript: Object Literal Expression
  6. JavaScript: Find Object's Prototype
  7. JavaScript: How to Create Object with Parent X?
  8. JavaScript: Prevent Adding Property
  9. JavaScript: Determine Type of Object
  10. JavaScript: Primitive Value Object Wrapper
  11. JavaScript: Clone, Deep Copy Object/Array
  12. JavaScript: Test Equality of Objects

  1. JavaScript: Object Object
  2. JavaScript: Object.prototype
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