<div class="intro">
<p>The YUI Global Object includes several useful type-checking methods in the `Lang`
object.  In addition to the `'isXYZ'` type check methods, YUI 3 includes
`Y.Lang.type`, which returns a string representing the type of the tested
object.  Click the "Check" button in each row to evaluate the data.</p>

</div>

<div class="example">
    {{>yui-isa}}
</div>

<h3>Type Checking with YUI</h3>

```
YUI().use('node', function(Y) {
    // This method is in the core of the library, so we don't have to use() any
    // additional modules to access it.  However, this example requires 'node'.
```

<h3>Checking types</h3>
<p>In this example, we use a few of the type-checking methods available in
`Lang` to test various types of data.</p>

```
// Test the input using Y.Lang type checking methods
var checkType = function (val) {
    return {
        'object'  : Y.Lang.isObject(val),
        'array'   : Y.Lang.isArray(val),
        'function': Y.Lang.isFunction(val),
        'type'    : Y.Lang.type(val)
    };
};
```

<h3>Full Source</h3>

```
{{>yui-isa-js}}
```