code not Professional in file index.js

[ClickCyber]

The code supports up to 300K in addition to being long and unnecessary it can be shortened to 6 lines !! example :

isEven = (n)=>{
    if (n % 2 == 1)
        return false;
    return true;
}

[samuelmarina]

What is %? I don't get it

[Hocuri]

Yes, please don't put file size over readability. The old code is perfectly readable, while this would introduce some weird percentage arithmetic. It's safer to write out the cases explicitly.

What I do like in your code is that return true and return false is programmed out explicitly instead of doing some hard-to-read magic like return n % 2 == 0. Maybe you could make a PR that changes:

function isEven(number) {
...

to:

function isEven(number) {
    if (isEvenInternal(number))
        return true;
    return false;
}

function isEvenInternal(number) {
...

[Assassin-1234]

the thing with modulus operator (%) is that its an untested operator and not fit for production environment, this code is very very professional and useful. We have over a million lines. Yes, that's the symbol of professionalism