fontfaceonload
Version:
A simple utility to execute a callback when a webfont loads.
42 lines (33 loc) • 1.36 kB
Markdown
layout: default
categories: [config]
title: QUnit.extend
description: Copy the properties defined by the <code>mixin</code> object into the <code>target</code> object
## `QUnit.extend( target, mixin )`
Copy the properties defined by the `mixin` object into the `target` object
| 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.
### Example
Define a custom `mod2` assertion that tests if the provided numbers are equivalent in modulo 2.
```js
QUnit.test( "QUnit.extend", function( assert ) {
var base = {
a: 1,
b: 2,
z: 3
};
QUnit.extend( base, {
b: 2.5,
c: 3,
z: undefined
} );
assert.equal( base.a, 1, "Unspecified values are not modified" );
assert.equal( base.b, 2.5, "Existing values are updated" );
assert.equal( base.c, 3, "New values are defined" );
assert.ok( !( "z" in base ), "Values specified as `undefined` are removed" );
});
```