7 lines
240 B
JavaScript
7 lines
240 B
JavaScript
function combinations(k, arr, prefix = []) {
|
|
if (prefix.length == 0) arr = [...Array(arr).keys()];
|
|
if (k == 0) return [prefix];
|
|
return arr.flatMap((v, i) =>
|
|
combinations(k - 1, arr.slice(i + 1), [...prefix, v])
|
|
);
|
|
}
|