_.assign

The method is used to copy the values of all enumerable own properties from one or more source objects to a target object.

// Underscore: _.extendOwn
// Lodash
function Foo() {
  this.c = 3;
}
function Bar() {
  this.e = 5;
}
Foo.prototype.d = 4;
Bar.prototype.f = 6;
var result = _.assign(new Foo, new Bar);
console.log(result);
// output: { 'c': 3, 'e': 5 }
 
// Native
function Foo() {
  this.c = 3;
}
function Bar() {
  this.e = 5;
}
Foo.prototype.d = 4;
Bar.prototype.f = 6;
var result = Object.assign({}, new Foo, new Bar);
console.log(result);
// output: { 'c': 3, 'e': 5 }

Browser Support for Object.assign()

45.0 ✔	✔	34.0 ✔	✖	32.0 ✔	9.0 ✔