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    <h1 class="page-title">Source: polyfill/Map.js</h1>

    
    <section>
        <article>
            <pre class="prettyprint source linenums"><code>// Licensed Materials - Property of IBM
//
// IBM Watson Analytics
//
// (C) Copyright IBM Corp. 2015
//
// US Government Users Restricted Rights - Use, duplication or
// disclosure restricted by GSA ADP Schedule Contract with IBM Corp.

module.exports = ( function( ObjectPolyfill, EntryStore )
{
"use strict";
// Putting this in a var allows uglify to minify the code much more
var SET_SIZE = !( ( __ES__ >= 5 ) || ObjectPolyfill.propertyGetSetSupport );

/**
 * @classdesc Iterator for the Map polyfill.
 * @class module:barejs/polyfill.Map~MapIterator
 * @extends module:barejs/polyfill.EntryStore.Iterator
 */
function MapIterator( _kind, _store )
{
    EntryStore.Iterator.call( this, _kind, _store );
}

MapIterator.prototype = Object.create( EntryStore.Iterator.prototype,
/** @lends module:barejs/polyfill.Map~MapIterator */
{
    constructor: { writable: true, value: MapIterator }
} );

/**
 * @classdesc Mimics the implementation of a native {@link https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map Map}.
 * Has an O(n) lookup time for non String or Number keys, so cannot compete with a native Map (Which is supposed to have an O(1) lookup time).
 * @class module:barejs/polyfill.Map
 */
function Map()
{
    ObjectPolyfill.defineProperty( this, "_store", { value: new EntryStore( arguments[0], true ) }  );

    /*istanbul ignore if: NodeJS has property support*/
    if ( SET_SIZE )
        this.size = this._store.size;
}

ObjectPolyfill.defineProperties( Map.prototype,
/** @lends module:barejs/polyfill.Map# */
{
    _store: { value: null },

    /**
     * The size of the Map, which represents the number of entries currently in the Map.
     * @member {number}
     * @readonly
     */
    size: ( SET_SIZE ?
        /*istanbul ignore next*/ { writable: true, value: null } :
        { "get": function size(){ return this._store &amp;&amp; this._store.size; } } ),

    /**
     * Set a value for the specified key in the Map.
     * @function
     * @param _key The object to use as key.
     * @param _value The value to add.
     * @returns {module:barejs/polyfill.Map} The Map (for chaining)
     */
    "set": { value: function set( _key, _value )
    {
        this._store.set( _key, _value );
        /*istanbul ignore if: NodeJS has property support*/
        if ( SET_SIZE )
            this.size = this._store.size;

        return this;
    } },

    /**
     * Get the value for the specified key
     * @function
     * @param {object} _key The object to use as key.
     * @returns The value, or undefined if the key is not known.
     */
    "get": { value: function get( _key )
    {
        var entry = this._store.entries[this._store.indexOf( _key )];
        return entry &amp;&amp; entry[1];
    } },

    /**
     * Check if the Map has an entry for the specified key
     * @function
     * @param {object} _key The object to use as key.
     * @returns {boolean} True if there is an entry for the key, false otherwise
     */
    has: { value: function has( _key )
    {
        return this._store.indexOf( _key ) >= 0;
    } },

    /**
     * Remove the value for the specified key
     * @function
     * @param {object} _key The object to use as key.
     * @returns {boolean} True if the entry was deleted, false otherwise
     */
    "delete": { value: function _delete( _key )
    {
        var removed = this._store.remove( _key );
        /*istanbul ignore if: NodeJS has property support*/
        if ( SET_SIZE )
            this.size = this._store.size;
        return removed;
    } },

    clear: { value: function clear()
    {
        this._store.clear();
        /*istanbul ignore if: NodeJS has property support*/
        if ( SET_SIZE )
            this.size = this._store.size;
    } },

    /**
     * Iterate the Map
     * @function
     * @param {function} _callback The callback function.
     * @param [_thisArg] Optional: context to call the callback in.
     */
    forEach: { value: function forEach( _callback/*, _thisArg*/ )
    {
        this._store.forEach( this, _callback, arguments[1] );
    } },

    /**
     * Get a key iterator
     * @function
     * @returns {module:barejs/polyfill.Map~MapIterator} A key iterator
     */
    keys: { value: function keys()
    {
        return new MapIterator( "key", this._store );
    } },

    /**
     * Get a value iterator
     * @function
     * @returns {module:barejs/polyfill.Map~MapIterator} A value iterator
     */
    values: { value: function values()
    {
        return new MapIterator( "value", this._store );
    } },

    /**
     * Get an entry iterator
     * @function
     * @returns {module:barejs/polyfill.Map~MapIterator} A entry iterator
     */
    entries: { value: function entries()
    {
        return new MapIterator( "entry", this._store );
    } }
} );

ObjectPolyfill.setIterator( Map.prototype, Map.prototype.entries );

return Map;

}( require( "./Object" ), require( "./EntryStore" ) ) );
</code></pre>
        </article>
    </section>


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