array_utility.js

/*
    Copyright 2015 Jaycliff Arcilla
    
    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at
        
        http://www.apache.org/licenses/LICENSE-2.0
        
    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.
*/
/*jslint bitwise: true */
if (typeof Number.isNaN !== "function") {
    Number.isNaN = function (value) {
        "use strict";
        //return (typeof value === "number" && value !== value);
        //return (typeof value === "number" && Number.prototype.toString.call(value) === 'NaN');
        return (typeof value === "number" && isNaN(value));
    };
}
if (typeof Array.prototype.insertAt !== "function") {
    Array.prototype.insertAt = function insertAt(index, item) {
        "use strict";
        var i;
        index = index | 0;
        if (index < 0) {
            index = 0;
        } else if (index > this.length) {
            index = this.length;
        }
        switch (index) {
        case this.length:
            return this.push(item);
        case 0:
            return this.unshift(item);
        default:
            for (i = this.length; i > index; i -= 1) {
                this[i] = this[i - 1];
            }
            this[index] = item;
            return this.length;
        }
    };
}
if (typeof Array.prototype.removeAt !== "function") {
    Array.prototype.removeAt = function removeAt(index) {
        "use strict";
        var item,
            i,
            length = this.length,
            last_index = length - 1,
            update = false;
        // Always coerce non-number values to the number type
        index = index | 0;
        if (index >= 0) {
            if (index < length) {
                item = this[index];
                update = true;
            }
        } else {
            index = length + index;
            if (index > -1) {
                item = this[index];
                update = true;
            }
        }
        if (update) {
            for (i = index; i < last_index; i += 1) {
                this[i] = this[i + 1];
            }
            this.length = last_index;
        }
        return item;
    };
}
if (typeof Array.prototype.removeItemsByValue !== "function") {
    Array.prototype.removeItemsByValue = function (value) {
        "use strict";
        var i;
        if (Number.isNaN(value)) {
            i = this.length;
            while (i !== 0) {
                i -= 1;
                if (Number.isNaN(this[i])) {
                    this.removeAt(i);
                }
            }
        } else {
            i = this.indexOf(value);
            while (i !== -1) {
                this.removeAt(i);
                i = this.indexOf(value);
            }
        }
        return this.length;
    };
}