mixedcollection.js

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        return this.removeAt(this.indexOfKey(key));
    },

/**
 * Returns the number of items in the collection.
 * @return {Number} the number of items in the collection.
 */
    getCount : function(){
        return this.length;
    },

/**
 * Returns index within the collection of the passed Object.
 * @param {Object} o The item to find the index of.
 * @return {Number} index of the item.
 */
    indexOf : function(o){
        return this.items.indexOf(o);
    },

/**
 * Returns index within the collection of the passed key.
 * @param {String} key The key to find the index of.
 * @return {Number} index of the key.
 */
    indexOfKey : function(key){
        return this.keys.indexOf(key);
    },

/**
 * Returns the item associated with the passed key OR index. Key has priority over index.  This is the equivalent
 * of calling {@link #key} first, then if nothing matched calling {@link #itemAt}.
 * @param {String/Number} key The key or index of the item.
 * @return {Object} The item associated with the passed key.
 */
    item : function(key){
        var item = typeof this.map[key] != "undefined" ? this.map[key] : this.items[key];
        return typeof item != 'function' || this.allowFunctions ? item : null; // for prototype!
    },

/**
 * Returns the item at the specified index.
 * @param {Number} index The index of the item.
 * @return {Object} The item at the specified index.
 */
    itemAt : function(index){
        return this.items[index];
    },

/**
 * Returns the item associated with the passed key.
 * @param {String/Number} key The key of the item.
 * @return {Object} The item associated with the passed key.
 */
    key : function(key){
        return this.map[key];
    },

/**
 * Returns true if the collection contains the passed Object as an item.
 * @param {Object} o  The Object to look for in the collection.
 * @return {Boolean} True if the collection contains the Object as an item.
 */
    contains : function(o){
        return this.indexOf(o) != -1;
    },

/**
 * Returns true if the collection contains the passed Object as a key.
 * @param {String} key The key to look for in the collection.
 * @return {Boolean} True if the collection contains the Object as a key.
 */
    containsKey : function(key){
        return typeof this.map[key] != "undefined";
    },

/**
 * Removes all items from the collection.  Fires the {@link #clear} event when complete.
 */
    clear : function(){
        this.length = 0;
        this.items = [];
        this.keys = [];
        this.map = {};
        this.fireEvent("clear");
    },

/**
 * Returns the first item in the collection.
 * @return {Object} the first item in the collection..
 */
    first : function(){
        return this.items[0];
    },

/**
 * Returns the last item in the collection.
 * @return {Object} the last item in the collection..
 */
    last : function(){
        return this.items[this.length-1];
    },

    // private
    _sort : function(property, dir, fn){
        var dsc = String(dir).toUpperCase() == "DESC" ? -1 : 1;
        fn = fn || function(a, b){
            return a-b;
        };
        var c = [], k = this.keys, items = this.items;
        for(var i = 0, len = items.length; i < len; i++){
            c[c.length] = {key: k[i], value: items[i], index: i};
        }
        c.sort(function(a, b){
            var v = fn(a[property], b[property]) * dsc;
            if(v == 0){
                v = (a.index < b.index ? -1 : 1);
            }
            return v;
        });
        for(var i = 0, len = c.length; i < len; i++){
            items[i] = c[i].value;
            k[i] = c[i].key;
        }
        this.fireEvent("sort", this);
    },

    /**
     * Sorts this collection with the passed comparison function
     * @param {String} direction (optional) "ASC" or "DESC"
     * @param {Function} fn (optional) comparison function
     */
    sort : function(dir, fn){
        this._sort("value", dir, fn);
    },

    /**
     * Sorts this collection by keys
     * @param {String} direction (optional) "ASC" or "DESC"
     * @param {Function} fn (optional) a comparison function (defaults to case insensitive string)
     */
    keySort : function(dir, fn){
        this._sort("key", dir, fn || function(a, b){
            return String(a).toUpperCase()-String(b).toUpperCase();
        });
    },

    /**
     * Returns a range of items in this collection
     * @param {Number} startIndex (optional) defaults to 0
     * @param {Number} endIndex (optional) default to the last item
     * @return {Array} An array of items
     */
    getRange : function(start, end){
        var items = this.items;
        if(items.length < 1){
            return [];
        }
        start = start || 0;
        end = Math.min(typeof end == "undefined" ? this.length-1 : end, this.length-1);
        var r = [];
        if(start <= end){
            for(var i = start; i <= end; i++) {
        	    r[r.length] = items[i];
            }
        }else{
            for(var i = start; i >= end; i--) {
        	    r[r.length] = items[i];
            }
        }
        return r;
    },

    /**
     * Filter the <i>objects</i> in this collection by a specific property.
     * Returns a new collection that has been filtered.
     * @param {String} property A property on your objects
     * @param {String/RegExp} value Either string that the property values
     * should start with or a RegExp to test against the property
     * @param {Boolean} anyMatch (optional) True to match any part of the string, not just the beginning
     * @param {Boolean} caseSensitive (optional) True for case sensitive comparison (defaults to False).
     * @return {MixedCollection} The new filtered collection
     */
    filter : function(property, value, anyMatch, caseSensitive){
        if(Ext.isEmpty(value, false)){
            return this.clone();
        }
        value = this.createValueMatcher(value, anyMatch, caseSensitive);
        return this.filterBy(function(o){
            return o && value.test(o[property]);
        });
	},

    /**
     * Filter by a function. Returns a <i>new</i> collection that has been filtered.
     * The passed function will be called with each object in the collection.
     * If the function returns true, the value is included otherwise it is filtered.
     * @param {Function} fn The function to be called, it will receive the args o (the object), k (the key)
     * @param {Object} scope (optional) The scope of the function (defaults to this)
     * @return {MixedCollection} The new filtered collection
     */
    filterBy : function(fn, scope){
        var r = new Ext.util.MixedCollection();
        r.getKey = this.getKey;
        var k = this.keys, it = this.items;
        for(var i = 0, len = it.length; i < len; i++){
            if(fn.call(scope||this, it[i], k[i])){
				r.add(k[i], it[i]);
			}
        }
        return r;
    },

    /**
     * Finds the index of the first matching object in this collection by a specific property/value.
     * @param {String} property The name of a property on your objects.
     * @param {String/RegExp} value A string that the property values
     * should start with or a RegExp to test against the property.
     * @param {Number} start (optional) The index to start searching at (defaults to 0).
     * @param {Boolean} anyMatch (optional) True to match any part of the string, not just the beginning.
     * @param {Boolean} caseSensitive (optional) True for case sensitive comparison.
     * @return {Number} The matched index or -1
     */
    findIndex : function(property, value, start, anyMatch, caseSensitive){
        if(Ext.isEmpty(value, false)){
            return -1;
        }
        value = this.createValueMatcher(value, anyMatch, caseSensitive);
        return this.findIndexBy(function(o){
            return o && value.test(o[property]);
        }, null, start);
	},

    /**
     * Find the index of the first matching object in this collection by a function.
     * If the function returns <i>true</i> it is considered a match.
     * @param {Function} fn The function to be called, it will receive the args o (the object), k (the key).
     * @param {Object} scope (optional) The scope of the function (defaults to this).
     * @param {Number} start (optional) The index to start searching at (defaults to 0).
     * @return {Number} The matched index or -1
     */
    findIndexBy : function(fn, scope, start){
        var k = this.keys, it = this.items;
        for(var i = (start||0), len = it.length; i < len; i++){
            if(fn.call(scope||this, it[i], k[i])){
				return i;
            }
        }
        if(typeof start == 'number' && start > 0){
            for(var i = 0; i < start; i++){
                if(fn.call(scope||this, it[i], k[i])){
                    return i;
                }
            }
        }
        return -1;
    },

    // private
    createValueMatcher : function(value, anyMatch, caseSensitive){
        if(!value.exec){ // not a regex
            value = String(value);
            value = new RegExp((anyMatch === true ? '' : '^') + Ext.escapeRe(value), caseSensitive ? '' : 'i');
        }
        return value;
    },

    /**
     * Creates a duplicate of this collection
     * @return {MixedCollection}
     */
    clone : function(){
        var r = new Ext.util.MixedCollection();
        var k = this.keys, it = this.items;
        for(var i = 0, len = it.length; i < len; i++){
            r.add(k[i], it[i]);
        }
        r.getKey = this.getKey;
        return r;
    }
});
/**
 * Returns the item associated with the passed key or index.
 * @method
 * @param {String/Number} key The key or index of the item.
 * @return {Object} The item associated with the passed key.
 */
Ext.util.MixedCollection.prototype.get = Ext.util.MixedCollection.prototype.item;