diff --git a/.gitignore b/.gitignore
index 6c589c2f8..f3f2f9494 100644
--- a/.gitignore
+++ b/.gitignore
@@ -59,3 +59,5 @@ typings/
 
 .netlify
 dist/
+exercise
+live
diff --git a/Week3/homework/step2-1.js b/Week3/homework/step2-1.js
index d5699882c..dfb470867 100644
--- a/Week3/homework/step2-1.js
+++ b/Week3/homework/step2-1.js
@@ -2,8 +2,7 @@
 
 function foo(func) {
   // What to do here?
-  // Replace this comment and the next line with your code
-  console.log(func);
+  func();
 }
 
 function bar() {
diff --git a/Week3/homework/step2-2.js b/Week3/homework/step2-2.js
index dcd135040..75ee426c7 100644
--- a/Week3/homework/step2-2.js
+++ b/Week3/homework/step2-2.js
@@ -2,19 +2,26 @@
 
 function threeFive(startIndex, stopIndex, threeCallback, fiveCallback) {
   const numbers = [];
-
-  // Replace this comment and the next line with your code
-  console.log(startIndex, stopIndex, threeCallback, fiveCallback, numbers);
+  for (let i = startIndex; i <= stopIndex; i++) {
+    numbers.push(i);
+  }
+  for (let i = startIndex; i <= stopIndex; i++) {
+    if (i % 3 === 0) {
+      threeCallback(i);
+    }
+    if (i % 5 === 0) {
+      fiveCallback(i);
+    }
+  }
+  console.log('numbers:', numbers);
 }
 
 function sayThree(number) {
-  // Replace this comment and the next line with your code
-  console.log(number);
+  console.log(number, 'can be divided by 3');
 }
 
 function sayFive(number) {
-  // Replace this comment and the next line with your code
-  console.log(number);
+  console.log(number, 'can be divided by 5');
 }
 
 threeFive(10, 15, sayThree, sayFive);
diff --git a/Week3/homework/step2-3.js b/Week3/homework/step2-3.js
index 5278d64f4..3d41f68d9 100644
--- a/Week3/homework/step2-3.js
+++ b/Week3/homework/step2-3.js
@@ -5,8 +5,9 @@ function repeatStringNumTimesWithFor(str, num) {
   // eslint-disable-next-line
   let result = '';
 
-  // Replace this comment and the next line with your code
-  console.log(str, num, result);
+  for (num; num > 0; num--) {
+    result += str;
+  }
 
   return result;
 }
@@ -18,8 +19,10 @@ function repeatStringNumTimesWithWhile(str, num) {
   // eslint-disable-next-line
   let result = '';
 
-  // Replace this comment and the next line with your code
-  console.log(str, num, result);
+  while (num > 0) {
+    result += str;
+    num--;
+  }
 
   return result;
 }
@@ -30,10 +33,12 @@ console.log('while', repeatStringNumTimesWithWhile('abc', 3));
 function repeatStringNumTimesWithDoWhile(str, num) {
   // eslint-disable-next-line
   let result = '';
-
-  // Replace this comment and the next line with your code
-  console.log(str, num, result);
-
+  if (num > 0) {
+    do {
+      result += str;
+      num--;
+    } while (num > 0);
+  }
   return result;
 }
 
diff --git a/Week3/homework/step2-4.js b/Week3/homework/step2-4.js
index b11b1dcb6..ed9ec75a4 100644
--- a/Week3/homework/step2-4.js
+++ b/Week3/homework/step2-4.js
@@ -1,7 +1,9 @@
 'use strict';
 
 function Dog() {
-  // add your code here
+  this.name = 'rocky';
+  this.color = 'red';
+  this.numLegs = 5;
 }
 
 const hound = new Dog();
diff --git a/Week3/homework/step2-5.js b/Week3/homework/step2-5.js
index cbb54fa1d..6367554ac 100644
--- a/Week3/homework/step2-5.js
+++ b/Week3/homework/step2-5.js
@@ -4,8 +4,11 @@ function multiplyAll(arr) {
   // eslint-disable-next-line
   let product = 1;
 
-  // Replace this comment and the next line with your code
-  console.log(arr, product);
+  for (let i = 0; i < arr.length; i++) {
+    for (let j = 0; j < arr[i].length; j++) {
+      product = arr[i][j] * product;
+    }
+  }
 
   return product;
 }
diff --git a/Week3/homework/step2-6.js b/Week3/homework/step2-6.js
index 76e458e4c..0d9da0fef 100644
--- a/Week3/homework/step2-6.js
+++ b/Week3/homework/step2-6.js
@@ -4,13 +4,21 @@ const arr2d = [[1, 2], [3, 4], [5, 6]];
 const arr3d = [[[1, 2], [3, 4]], [[5, 6], [7, 8]]];
 
 function printArray2d(arr) {
-  // Replace this comment and the next line with your code
-  console.log(arr);
+  for (let i = 0; i < arr.length; i++) {
+    for (let j = 0; j < arr[i].length; j++) {
+      console.log(arr[i][j]);
+    }
+  }
 }
 
 function printArray3d(arr) {
-  // Replace this comment and the next line with your code
-  console.log(arr);
+  for (let i = 0; i < arr.length; i++) {
+    for (let j = 0; j < arr[i].length; j++) {
+      for (let k = 0; k < arr[i][j].length; k++) {
+        console.log(arr[i][j][k]);
+      }
+    }
+  }
 }
 
 printArray2d(arr2d);
diff --git a/Week3/homework/step2-7.js b/Week3/homework/step2-7.js
index 3e72e8551..8b86c0376 100644
--- a/Week3/homework/step2-7.js
+++ b/Week3/homework/step2-7.js
@@ -20,4 +20,8 @@ f2(y);
 
 console.log(y);
 
-// Add your explanation as a comment here
+// Pass by value rule: if you use a variable inside a function and change its value
+// it doesn't affect variable's value which is outside of the function.
+
+// Pass by reference rule: if you use a variable's address or reference inside a function
+// and change them it affects variable's value which is outside of the function.
diff --git a/Week3/homework/step3-bonus.js b/Week3/homework/step3-bonus.js
index 917091d61..0ccb6912a 100644
--- a/Week3/homework/step3-bonus.js
+++ b/Week3/homework/step3-bonus.js
@@ -3,8 +3,7 @@
 const values = ['a', 'b', 'c', 'd', 'a', 'e', 'f', 'c'];
 
 function makeUnique(arr) {
-  // Replace this comment and the next line with your code
-  console.log(arr);
+  return arr.filter((x, y, z) => z.indexOf(x) === y);
 }
 
 const uniqueValues = makeUnique(values);
diff --git a/Week3/homework/step3.js b/Week3/homework/step3.js
index 292724bf4..aec4296cf 100644
--- a/Week3/homework/step3.js
+++ b/Week3/homework/step3.js
@@ -1,8 +1,9 @@
 'use strict';
 
 function createBase(base) {
-  // Replace this comment and the next line with your code
-  console.log(base);
+  return function addSix(num) {
+    return base + num;
+  };
 }
 
 const addSix = createBase(6);