What is Object.assign()? and how to use Object.assign()?

Question: What is Object.assign()?
The Object.assign() is used to copy the values of all properties from one or more source objects to a target object.



Question: What is syntax for Object.assign()?

Object.assign(target, ...sources);

Example 1

const object1 = {
  a: 1,
  b: 2,
  c: 3
};
const object2 = Object.assign(object1,{d:4});
console.log(object2);

Output

Object { a: 1, b: 2, c: 3, d: 4 }

Example 2

const object1 = {
  a: 1,
  b: 2,
  c: 3
};
const object2 = Object.assign(object1,{d:4,e:5, a:11});
console.log(object2);

Output

Object { a: 11, b: 2, c: 3, d: 4, e: 5 }

Example 3

const object1 = {
  a: 1,
  b: 2,
  c: 3
};
const object2 = Object.assign(object1,{d:4,e:5, a:11},{f:5, a:111});
console.log(object2);

Output

Object { a: 111, b: 2, c: 3, d: 4, e: 5, f: 5 }

Example 4

const object1 = {
  a: 1,
  b: 2,
  c: 3
};
const object2 = Object.assign(object1,{d:4,e:5, a:11},{f:5, a:111},null, undefined);
console.log(object2);

Output

Object { a: 111, b: 2, c: 3, d: 4, e: 5, f: 5 }

Example 5

const object1 = {
  a: 1,
  b: 2,
  c: 3
};
const object2 = Object.assign(object1,{d:4,e:5, a:11},{f:5, a:111},null, undefined,{g:6, a:1111});
console.log(object2);

Output

Object { a: 1111, b: 2, c: 3, d: 4, e: 5, f: 5, g: 6 }