Test Driven Interview Question CMM

trial.js

function withFor(list) {
	var sum = 0;
	list.forEach( function(item) {
		if (typeof item === 'number') {
			sum += item;
		}
	});
	return sum
};

function withWhile(list) {
	var sum = 0;
	var iter = 0;
	while(list.length > iter) {
		if (typeof list[iter] === 'number') {
			sum += list[iter];
		}
		iter++;
	}
	return sum
}

function withRecursion(list) {
	var sum = 0;
	if (list.length == 0){
		return 0;
	}
	var num = list.pop();
	if (typeof num === 'number') {
		sum += num;
	}
	sum += withRecursion(list);
	return sum
}

function callME (func) {
	console.log(func([1,2,3,4,5,'hi', undefined, 5]), 'should be 20');
	console.log(func([1,2,3,4,5,'hi', undefined]), 'should be 15');
	console.log(func([1]), 'should be 1');
	console.log(func([]), 'should be 0');
	console.log(func([undefined]), 'should be 0');
}

callME(withRecursion);
callME(withWhile);
callME(withFor);