Problems › JavaScript › patterns
Write the field out in binary
A diagnostics screen prints a flags field as ones and zeros so an engineer can see at a glance which switches are on.
- Return the binary digits, most significant first.
- No leading zeros — except zero itself, which is written "0".
- The value is never negative.
toBinary(flags: int) → string
Where you start
function toBinary(flags) {
}Worked examples
| Call | Result |
|---|---|
toBinary(5) | "101" |
toBinary(0) | "0" |
toBinary(1) | "1" |
toBinary(8) | "1000" |
Hint
Peel off the lowest bit with a mask, shift down, and repeat. The digits come out backwards, so reverse them at the end.
Reference solution in JavaScript
function toBinary(flags) {
if (flags === 0) return "0";
let digits = "";
let field = flags;
while (field > 0) {
digits = String(field & 1) + digits;
field >>= 1;
}
return digits;
}