Couple of custom written prototype methods for TypedArrays in JavaScript

 // In case I'd add new features : // @https://codepen.io/projektorius96/pen/xxdvqpZ // === // SYNOPSIS [].purify() : let arr1 = ["4", 5, undefined, null, ""]; // concrete practical example Array.prototype.purify = function(){ for (let index = 0; index < /* arr1 */this.length; index++){ for (let nonExsisting of [undefined, null, ""]) { if (/* arr1 */this[index] == nonExsisting) { /* arr1 */this[index] = "0"; /* console.log(' converted to "0" successfully ') */ } else { /* console.log(' item was already typeof "string" ') */ }; } } for (let item in /* arr1 */this) { if(typeof /* arr1 */this[item] != "string") {/* arr1 */this[item] = /* arr1 */this[item].toString(); console.log("value stringified: ", ) } } return this; } let res = arr1.purify(); console.log(res); // === // SYNOPSIS [].deleteItems(/* atPos, end, included = false | if true - end will be included */) : let months = ['Jan', 'March', 'April', 'June']; let variousTypes = ["4", 5, undefined, null, ""]; Array.prototype.deleteItems = function(atPos, end, included = false){ for (let pointer = 0; pointer < this.length ; pointer++) { // console.log("BEFORE IF: ", pointer, atPos, end) if (included) { if (pointer == atPos && atPos <= end) { // console.log("before delete & increment: ", pointer, atPos, end) delete this[pointer]; atPos++; // 1 // console.log("after delete & increment: ", pointer, atPos , end); } // break; [this was a culprit so commented out] } else { if (pointer == atPos && atPos < end) { // console.log("before delete & increment: ", pointer, atPos, end) delete this[pointer]; atPos++; // 1 // console.log("after delete & increment: ", pointer, atPos , end); } } } return this; } variousTypes.deleteItems(0, 2) console.log("(end) not included", variousTypes); variousTypes = ["4", 5, undefined, null, ""]; // restore variousTypes for another try ; // IMPORTANT NOTICE : even without restoring variousTypes <empty> indices will be iterated over whatsoever i.e. not ignored by pointer variousTypes.deleteItems(0, 2, true); console.log("(end) is included", variousTypes); months.deleteItems(0,2); console.log("months after deletion: ", months); // months after deletion: (4) [empty × 2, "April", "June"] months = ['Jan', 'March', 'April', 'June']; // restore values to (4) ["Jan", "March", "April", "June"] for another try ; months.deleteItems(0,2, true); // (4) [empty × 3, "June"] // p.s. I left my comments at some point as someone may find it helpful whilst examining each prototype