# Yahoo! UI Library

### attribute 3.0.0

Yahoo! UI Library > attribute > State
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## Class State

The State class maintains state for a collection of named items, with a varying number of properties defined. It avoids the need to create a separate class for the item, and separate instances of these classes for each item, by storing the state in a 2 level hash table, improving performance when the number of items is likely to be large.

### Constructor

State `( )`

### Properties

#### data - `object`

Hash of attributes

### Methods

#### add

`void add ( name , key , val )`
Adds a property to an item.

Parameters:
  `name <String>` The name of the item.
  `key <String>` The name of the property.
  `val <Any>` The value of the property.

#### addAll

`void addAll ( name , o )`
Adds multiple properties to an item.

Parameters:
  `name <String>` The name of the item.
  `o <Object>` A hash of property/value pairs.

#### get

`Any get ( name , key )`
For a given item, returns the value of the property requested, or undefined if not found.

Parameters:
  `name <String>` The name of the item
  `key <String>` Optional. The property value to retrieve.

Returns: `Any`
  The value of the supplied property.

#### getAll

`Object getAll ( name )`
For the given item, returns a disposable object with all of the item's property/value pairs.

Parameters:
  `name <String>` The name of the item

Returns: `Object`
  An object with property/value pairs for the item.

#### remove

`void remove ( name , key )`
Removes a property from an item.

Parameters:
  `name <String>` The name of the item.
  `key <String>` The property to remove.

#### removeAll

`void removeAll ( name , o )`
Removes multiple properties from an item, or remove the item completely.

Parameters:
  `name <String>` The name of the item.
  `o <Object|Array>` Collection of properties to delete. If not provided, the entire item is removed.

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