logic - How to add up numbers in a nested array javascript -

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just working on project , tried few different solutions no results. me how add numbers in nested array? use reduce? or loop? 

function balance(arr) {   if(typeof item == 'number') {     return arr;enter code here   } else {     return arr + balance(item);   } }

is maybe hoping for?

function balance(arr) {   return arr.reduce(function(sum, item) {     if(typeof item == 'number') {       return sum;     } else {       return sum + balance(item);     }   },0); }  console.log(balance([1,2,[3,4],5]));

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