Help Daniel play his game based on possible combination of number

HelpDaniel.js

const helpDaniel = ( nums ) => {


	if( nums == null || nums == undefined || nums.length == 0 ) return [];


	const output = [];
	const keys = [ 

		"0",
		"1",
		"abc", // keypad 2
		"def", // keypad 3
		"ghi", // keypad 4
		"jkl", // keypad 5
		"mno", // keypad 6
		"pqrs", // keypad 7
		"tuv", // keypad 8
		"wxyz" // keypad 9

	]

	computeCombination( nums,output,"",0,keys  );
	return output;
}


const computeCombination = ( nums,output,value,pos,keys ) =>{


	if( pos == nums.length ){
		output.push(value);
		return;
	}

	let alphabets = keys[ nums[pos] ];
	for(let i=0; i<alphabets.length; i++){
		computeCombination( nums,output,value+alphabets[i],pos+1,keys );
	}



}


console.log( helpDaniel("2356") );

Hello @enaiho, congratulations 🎉 your solution has been selected as one of the winning solutions in Week 8 of #AlgorithmFridays.

Your solution is clean, readable and passed the tests. I like the robust checks on line 4 and your use of recursion for solving this problem - that was neat!

Out of the many winning solutions, only 3 will be selected for the $20 prize in a raffle draw. The raffle draw will hold today, Friday June 4 at 3.00pm WAT (7.00 am PST)

If you are interested in being a part of the raffle draw, please send me a DM on Twitter @meekg33k so I can share the event invite with you.

NB: Only solutions of participants who indicated interest in the raffle draw will be considered.

Thanks once again for participating and see you later today for Week 9 of #AlgorithmFridays.