Below is are the trim(), ltrim() and rtrim() functionality for strings in Javascript:

/********** String Trim Utilites *********************/


String.prototype.trim = function () {

    return this.replace(/^s+|s+$/g, "");

}

String.prototype.ltrim = function () {

    return this.replace(/^s+/, "");

}

String.prototype.rtrim = function () {

    return this.replace(/s+$/, "");

}