This content originally appeared on DEV Community and was authored by Lukas Gaucas
I started transitioning from Node.js (more precisely – JavaScript) to Golang (Go) I've touched the subject of TypedArrays in general in this article . As TypedArrays require[s] strictly to be contained data of one type , I decided I should share this abandoned custom prototype I've wrote recently that my be handy for some of you, folks ! :
// 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
In each augment Array.prototype the keyword this
should be replaced with a real life single dimensional array ; in case you have n-th multi-dimension array , first make it to be de-flatted with built-in .flat() & only when apply my provided custom prototype methods .
Hopefully someone will find it helpful, thanks & see you in the next one !
This content originally appeared on DEV Community and was authored by Lukas Gaucas
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Lukas Gaucas | Sciencx (2022-04-07T17:28:16+00:00) Couple of custom written prototype methods for TypedArrays in JavaScript. Retrieved from https://www.scien.cx/2022/04/07/couple-of-custom-written-prototype-methods-for-typedarrays-in-javascript/
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