QUnit.extend()

version added: 1.0.0.

QUnit.extend( target, mixin )

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

It is recommended to use the built-in Object.assign() instead.

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('using extend', function (assert) {
  const base = {
    a: 1,
    b: 2,
    zed: 3
  };
  QUnit.extend(base, {
    b: 2.5,
    c: 3,
    zed: undefined
  });

  assert.strictEqual(base.a, 1, 'Unspecified keys remain unchanged');
  assert.strictEqual(base.b, 2.5, 'Matching keys are replaced');
  assert.strictEqual(base.c, 3, 'New keys are added');
  assert.false('zed' in base, 'Keys with the value `undefined` are removed');
});

Description

Examples