converting integer to different bases:

to convert a number to another representation, one can use toString(base).

for example:

> a.toString(16);
'4'
> a.toString(2);
'100'
> a.toString(8);
'4'
> a.toString(2).padStart(8);
'     100'
> a.toString(2).padStart(8,0);
'00000100'
>

say for example to have a base 2 number represented as 8 digits (a byte), one can use .padStart(desired_length, fill character).