Find all the possible combinations of a string.

combinations.js

'use strict' // Optional

export default function combinations(combos) {
	if (!Array.isArray(combos)) {
		combos = [combos];
	}
	
	const a = combos[combos.length - 1].split('');
	let b = a.shift();
	a.push(b);
	b = a.join('');
	
	if (!combos.includes(b)) {
		combos.push(b);
		return combinations(combos);
	}
	
	return combos;
}

example.md

import combinations from "./combinations.js";
combinations("abcdef"); // [ 'abcdef', 'bcdefa', 'cdefab', 'defabc', 'efabcd', 'fabcde' ]