solution 5

08_calculator/calculator.js

@@ -1,33 +1,69 @@
-const add = function() {
-	
+const add = function(num1, num2) {
+	total = num1 + num2;
+	console.log(total);
+	return total;
 };
 
-const subtract = function() {
-	
+const subtract = function(num1, num2) {
+	total = num1 - num2;
+	console.log(total);
+	return total;
 };
 
-const sum = function() {
-	
+const sum = function(arg) {
+	const array = arg;
+	console.log(array);
+	let total = 0;
+	for (i = 0; i < array.length; i++) {
+		total += array[i];
+	}
+	console.log(total);
+	return total;
 };
 
-const multiply = function() {
-
+const multiply = function(arg) {
+	const array = arg;
+	console.log(array);
+	let total = 1;
+	for (i = 0; i < array.length; i++) {
+		total = total * array[i];
+	}
+	console.log(total);
+	return total;
 };
+//multiply([-4,4])
 
-const power = function() {
-	
+const power = function(num, factor) {
+	total = Math.pow(num, factor);
+
+	console.log(total);
+	return total;
 };
+//  power(2,2)
 
-const factorial = function() {
-	
+const factorial = function(num) {
+	if (num === 0 || num === 1) {
+		console.log('1');
+		return 1;
+	} else {
+		for (var i = num - 1; i >= 1; i--) {
+			num *= i;
+		}
+	}
+	console.log(num);
+	return num;
 };
+factorial(6);
 
+//add(2, 4);
+//subtract ( 1, -10)
+//sum([ 1, 3, 2 ]);
 // Do not edit below this line
 module.exports = {
-  add,
-  subtract,
-  sum,
-  multiply,
-  power,
-  factorial
+	add,
+	subtract,
+	sum,
+	multiply,
+	power,
+	factorial
 };