i just came here to ask this too

'bitwise op' just removes decimals part,
but Math.floor(...) actually round a number down as it said lately 'mr royce-reed',
so it also behave pretty weird when we working with numbers
which not contains into int-type(border:+-2147483647)
StackOverflow question:
https://stackoverflow.com/questions/13847053/difference-between-and-math-floor

~~ is just shorthand for Math.floor()

not really

const x = 8589934592.5;
Math.floor(x);
// 8589934592
~~(x) ;
// 0

~~ is just shorthand for Math.floor() and the plus sign is just a plus sign 😝
OP did recursion instead of iterating ... slick but hard to read

it's a nested function

However, your solution is more understandable to other people))))