QUnit.extend() - Qunit

QUnit.extend( target, mixin )

Copy the properties defined by a mixin object into a target object.

<p class="note note--warning" markdown="1">This method is __deprecated__ and it's recommended to use [`Object.assign()`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign) instead.</p>

name	description
`target`	An object whose properties are to be modified
`mixin`	An object describing which properties should be modified

This method will modify the target object to contain the "own" properties defined by the mixin. If the mixin object specifies the value of any attribute as undefined, this property will instead be removed from the target object.

Examples

Use QUnit.extend to merge two objects.

QUnit.test('QUnit.extend', assert => {
  const base = {
    a: 1,
    b: 2,
    z: 3
  };
  QUnit.extend(base, {
    b: 2.5,
    c: 3,
    z: undefined
  });

  assert.strictEqual(base.a, 1, 'Unspecified values are not modified');
  assert.strictEqual(base.b, 2.5, 'Existing values are updated');
  assert.strictEqual(base.c, 3, 'New values are defined');
  assert.false('z' in base, 'Values specified as `undefined` are removed');
});