Completed calculations

08_calculator/calculator.js

@@ -1,25 +1,47 @@
-const add = function() {
+const add = function(a,b) {
+	return a+b;
+};
+
+const subtract = function(a,b) {
+  return a-b;
+};
+
+const sum = (nums)=>{
+  let total=0;
+	for(let i in nums){
+    total += nums[i];
+  }
+  return total;
+};
+
+const multiply = (...args) => {
+  let total=1;
+  let i=0;
+  for(let i in args){
+    // console.log("i: "+i+" args[i]: "+args[i]);
+    total *= args[i];
+    i++;
+  }
+  console.log(total);
+  return total;
 
 };
 
-const subtract = function() {
-	
+const power = (a,b)=> {
+	let total=1;
+  for(let i = 0; i<b; i++){
+    total *= a;
+  }
+  return total; 
 };
 
-const sum = function() {
-	
-};
-
-const multiply = function() {
-
-};
-
-const power = function() {
-	
-};
-
-const factorial = function() {
-	
+const factorial = function(a) {
+  let multplyNums =[];
+  for(i=a; i>0; i--){
+    multplyNums.push(i);
+  }
+  return(
+  multplyNums.reduce((result,num)=> result *= num,1));
 };
 
 // Do not edit below this line

08_calculator/calculator.spec.js

@@ -5,73 +5,73 @@ describe('add', () => {
 		expect(calculator.add(0,0)).toBe(0);
 	});
 
-	test.skip('adds 2 and 2', () => {
+	test('adds 2 and 2', () => {
 		expect(calculator.add(2,2)).toBe(4);
 	});
 
-	test.skip('adds positive numbers', () => {
+	test('adds positive numbers', () => {
 		expect(calculator.add(2,6)).toBe(8);
 	});
 });
 
 describe('subtract', () => {
-	test.skip('subtracts numbers', () => {
+	test('subtracts numbers', () => {
 		expect(calculator.subtract(10,4)).toBe(6);
 	});
 });
 
 describe('sum', () => {
-	test.skip('computes the sum of an empty array', () => {
+	test('computes the sum of an empty array', () => {
 		expect(calculator.sum([])).toBe(0);
 	});
 
-	test.skip('computes the sum of an array of one number', () => {
+	test('computes the sum of an array of one number', () => {
 		expect(calculator.sum([7])).toBe(7);
 	});
 
-	test.skip('computes the sum of an array of two numbers', () => {
+	test('computes the sum of an array of two numbers', () => {
 		expect(calculator.sum([7,11])).toBe(18);
 	});
 
-	test.skip('computes the sum of an array of many numbers', () => {
+	test('computes the sum of an array of many numbers', () => {
 		expect(calculator.sum([1,3,5,7,9])).toBe(25);
 	});
 });
 
 describe('multiply', () => {
-	test.skip('multiplies two numbers', () => {
+	test('multiplies two numbers', () => {
 		expect(calculator.multiply(2,4)).toBe(8);
 	});
 
-	test.skip('multiplies several numbers', () => {
+	test('multiplies several numbers', () => {
 		expect(calculator.multiply(2,4,6,8,10,12,14)).toBe(645120);
 	});
 });
 
 describe('power', () => {
-	test.skip('raises one number to the power of another number', () => {
+	test('raises one number to the power of another number', () => {
 		expect(calculator.power(4,3)).toBe(64); // 4 to third power is 64
 	});
 });
 
 describe('factorial', () => {
-	test.skip('computes the factorial of 0', () => {
+	test('computes the factorial of 0', () => {
 		expect(calculator.factorial(0)).toBe(1); // 0! = 1
 	});
 
-	test.skip('computes the factorial of 1', () => {
+	test('computes the factorial of 1', () => {
 		expect(calculator.factorial(1)).toBe(1);
 	});
 
-	test.skip('computes the factorial of 2', () => {
+	test('computes the factorial of 2', () => {
 		expect(calculator.factorial(2)).toBe(2);
 	});
 
-	test.skip('computes the factorial of 5', () => {
+	test('computes the factorial of 5', () => {
 		expect(calculator.factorial(5)).toBe(120);
 	});
 
-	test.skip('computes the factorial of 10', () => {
+	test('computes the factorial of 10', () => {
 		expect(calculator.factorial(10)).toBe(3628800);
 	});
 });