<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}}

```