# assignIn
> Copy enumerable own and inherited properties from one or more source objects to a target object.
## Usage
```javascript
var assignIn = require( '@stdlib/object/assign-in' );
```
#### assignIn( target, source1\[, source2\[,...,sourceN]] )
Copies enumerable own and inherited properties from one or more source objects to a target object.
```javascript
function Foo() {
this.a = 'beep';
return this;
}
Foo.prototype.b = 'boop';
var x = {};
var y = new Foo();
var z = assignIn( x, y );
// returns { 'a': 'beep', 'b': 'boop' }
var bool = ( z === x );
// returns true
```
## Notes
- If a property key is present in multiple sources, the property from the last source that defines the key prevails.
- The target object is mutated.
- Both string and symbol properties are copied.
## Examples
```javascript
var assignIn = require( '@stdlib/object/assign-in' );
function Foo() {
this.a = 1;
return this;
}
Foo.prototype.b = 2;
function Bar() {
this.c = 3;
return this;
}
Bar.prototype.d = 4;
var obj1 = new Foo();
var obj2 = new Bar();
var result = assignIn( {}, obj1, obj2 );
// returns { 'a': 1, 'b': 2, 'c': 3, 'd': 4 }
```