The Javascript Object assign() method copies enumerable and own properties from a source object to a target object. The whole operation (assignment and copy) is done by reference.
Syntax:
Object.assign(target, sources)
Parameters:
target: It represents the target object.
source: It represents the source object.
Return:
It returns the target object.
Example:
<!DOCTYPE html>
<html>
<body>
<script>
const first = {x: 1, y: 2, z: 3};
const second = Object.assign({x: 3, z: 4, w: 5}, first);
document.write(second.z + "</br>");
document.write(second.w + "</br>");
document.write(second.x);
</script>
</body>
</html>