Factorize a number FCC

Hey campers; am currently working on the factorize a number challenge each number works except for zero. this is my code what could be the problem?

function factorialize(num) {
var arr = [];
var singleVal =0;
for(i=1; i<num+1; i++){



singleVal = arr.reduce(function(a,b){return a*b;});
return singleVal;



So in short zero is coarsed to null/undefined?..the only way to solve this may to set an if statement “if(num===0){
return 1;}”


Good explanation here. :slight_smile:

if (num >= 1) {
        return //put it the factorialize
    return 1;
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