Source: JsExtensions.js

//-----------------------------------------------------------------------------
/**
 * This section contains some methods that will be added to the standard
 * Javascript objects.
 *
 * @namespace JsExtensions
 */

/**
 * Makes a shallow copy of the array.
 *
 * @memberof JsExtensions
 * @returns {array} A shallow copy of the array.
 */
Array.prototype.clone = function() {
    return this.slice(0);
};

Object.defineProperty(Array.prototype, "clone", {
    enumerable: false
});

/**
 * Checks whether the array contains a given element.
 *
 * @memberof JsExtensions
 * @param {any} element - The element to search for.
 * @returns {boolean} True if the array contains a given element.
 * @deprecated includes() should be used instead.
 */
Array.prototype.contains = function(element) {
    return this.includes(element);
};

Object.defineProperty(Array.prototype, "contains", {
    enumerable: false
});

/**
 * Checks whether the two arrays are the same.
 *
 * @memberof JsExtensions
 * @param {array} array - The array to compare to.
 * @returns {boolean} True if the two arrays are the same.
 */
Array.prototype.equals = function(array) {
    if (!array || this.length !== array.length) {
        return false;
    }
    for (let i = 0; i < this.length; i++) {
        if (this[i] instanceof Array && array[i] instanceof Array) {
            if (!this[i].equals(array[i])) {
                return false;
            }
        } else if (this[i] !== array[i]) {
            return false;
        }
    }
    return true;
};

Object.defineProperty(Array.prototype, "equals", {
    enumerable: false
});

/**
 * Removes a given element from the array (in place).
 *
 * @memberof JsExtensions
 * @param {any} element - The element to remove.
 * @returns {array} The array after remove.
 */
Array.prototype.remove = function(element) {
    for (;;) {
        const index = this.indexOf(element);
        if (index >= 0) {
            this.splice(index, 1);
        } else {
            return this;
        }
    }
};

Object.defineProperty(Array.prototype, "remove", {
    enumerable: false
});

/**
 * Generates a random integer in the range (0, max-1).
 *
 * @memberof JsExtensions
 * @param {number} max - The upper boundary (excluded).
 * @returns {number} A random integer.
 */
Math.randomInt = function(max) {
    return Math.floor(max * Math.random());
};

/**
 * Returns a number whose value is limited to the given range.
 *
 * @memberof JsExtensions
 * @param {number} min - The lower boundary.
 * @param {number} max - The upper boundary.
 * @returns {number} A number in the range (min, max).
 */
Number.prototype.clamp = function(min, max) {
    return Math.min(Math.max(this, min), max);
};

/**
 * Returns a modulo value which is always positive.
 *
 * @memberof JsExtensions
 * @param {number} n - The divisor.
 * @returns {number} A modulo value.
 */
Number.prototype.mod = function(n) {
    return ((this % n) + n) % n;
};

/**
 * Makes a number string with leading zeros.
 *
 * @memberof JsExtensions
 * @param {number} length - The length of the output string.
 * @returns {string} A string with leading zeros.
 */
Number.prototype.padZero = function(length) {
    return String(this).padZero(length);
};

/**
 * Checks whether the string contains a given string.
 *
 * @memberof JsExtensions
 * @param {string} string - The string to search for.
 * @returns {boolean} True if the string contains a given string.
 * @deprecated includes() should be used instead.
 */
String.prototype.contains = function(string) {
    return this.includes(string);
};

/**
 * Replaces %1, %2 and so on in the string to the arguments.
 *
 * @memberof JsExtensions
 * @param {any} ...args The objects to format.
 * @returns {string} A formatted string.
 */
String.prototype.format = function() {
    return this.replace(/%([0-9]+)/g, (s, n) => arguments[Number(n) - 1]);
};

/**
 * Makes a number string with leading zeros.
 *
 * @memberof JsExtensions
 * @param {number} length - The length of the output string.
 * @returns {string} A string with leading zeros.
 */
String.prototype.padZero = function(length) {
    return this.padStart(length, "0");
};