Week3 homework

Week1/homework/app.js

@@ -1,11 +0,0 @@
-'use strict';
-
-{
- const bookTitles = [
- // Replace with your own book titles
- 'harry_potter_chamber_secrets',
- ];
-
- // Replace with your own code
- console.log(bookTitles);
-}

Week1/homework/index.html

@@ -1 +0,0 @@
-<!-- replace this with your HTML content -->

Week1/homework/style.css

@@ -1 +0,0 @@
-/* add your styling here */

Week3/homework/step2-1.js

@@ -1,9 +1,7 @@
 'use strict';
 
 function foo(func) {
- // What to do here?
- // Replace this comment and the next line with your code
- console.log(func);
+ func();
 }
 
 function bar() {

Week3/homework/step2-2.js

@@ -1,22 +1,32 @@
 'use strict';
 
-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);
-}
-
 function sayThree(number) {
- // Replace this comment and the next line with your code
  console.log(number);
 }
 
 function sayFive(number) {
- // Replace this comment and the next line with your code
  console.log(number);
 }
 
+function threeFive(startIndex, stopIndex, threeCallback, fiveCallback) {
+ const numbers = [];
+ let numbersStart = startIndex;
+ const numbersEnd = stopIndex;
+ while (numbersStart <= numbersEnd) {
+ numbers.push(numbersStart);
+ numbersStart++;
+ }
+ for (let i = 0; i < numbers.length; i++) {
+ const number = numbers[i];
+ if (number % 3 === 0) {
+ threeCallback(number);
+ }
+ if (number % 5 === 0) {
+ fiveCallback(number);
+ }
+ }
+}
+
 threeFive(10, 15, sayThree, sayFive);
 
 // Do not change or remove anything below this line

Week3/homework/step2-3.js

@@ -4,10 +4,9 @@
 function repeatStringNumTimesWithFor(str, num) {
  // eslint-disable-next-line prefer-const
  let result = '';
-
- // Replace this comment and the next line with your code
- console.log(str, num, result);
-
+ for (let i = 0; i < num; i++) {
+ result += str;
+ }
  return result;
 }
 
@@ -17,10 +16,11 @@ console.log('for', repeatStringNumTimesWithFor('abc', 3));
 function repeatStringNumTimesWithWhile(str, num) {
  // eslint-disable-next-line prefer-const
  let result = '';
-
- // Replace this comment and the next line with your code
- console.log(str, num, result);
-
+ let counter = 0;
+ while (counter < num) {
+ result += str;
+ counter++;
+ }
  return result;
 }
 
@@ -30,14 +30,17 @@ console.log('while', repeatStringNumTimesWithWhile('abc', 3));
 function repeatStringNumTimesWithDoWhile(str, num) {
  // eslint-disable-next-line prefer-const
  let result = '';
-
- // Replace this comment and the next line with your code
- console.log(str, num, result);
-
+ let i = 0;
+ if (num > 0) {
+ do {
+ result += str;
+ i++;
+ } while (i < num);
+ }
  return result;
 }
 
-console.log('do-while', repeatStringNumTimesWithDoWhile('abc', 3));
+console.log('do-while', repeatStringNumTimesWithDoWhile('abc', 0));
 
 // Do not change or remove anything below this line
 module.exports = {

Week3/homework/step2-4.js

@@ -1,7 +1,9 @@
 'use strict';
 
 function Dog() {
- // add your code here
+ this.name = 'Fido';
+ this.color = 'white and brown';
+ this.numLegs = 4;
 }
 
 const hound = new Dog();

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 = product * arr[i][j];
+ }
+ }
 
  return product;
 }

Week3/homework/step2-6.js

@@ -4,13 +4,25 @@ const arr2d = [[1, 2], [3, 4], [5, 6]];
 const arr3d = [[[1, 2], [3, 4]], [[5, 6], [7, 8]]];
 
 function flattenArray2d(arr) {
- // Replace this comment and the next line with your code
- console.log(arr);
+ const newArray = [];
+ for (let i = 0; i < arr.length; i++) {
+ for (let j = 0; j < arr[i].length; j++) {
+ newArray.push(arr[i][j]);
+ }
+ }
+ return newArray.sort();
 }
 
 function flattenArray3d(arr) {
- // Replace this comment and the next line with your code
- console.log(arr);
+ const arr3dim = [];
+ 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++) {
+ arr3dim.push(arr[i][j][k]);
+ }
+ }
+ }
+ return arr3dim;
 }
 
 console.log(flattenArray2d(arr2d)); // -> [1, 2, 3, 4, 5, 6]

Week3/homework/step2-7.js

@@ -20,4 +20,8 @@ f2(y);
 
 console.log(y);
 
-// Add your explanation as a comment here
+/* In the x-code, we are logging the value of x, which has not changed. If we want this code to return 10, 
+we need to console.log(f1(x)). In the y-code, y is an object. The properties of an object can be altered this way, 
+so the function changes the value of x to 10. No alteration has been done to the variable reference itself. If f2 
+attempted to change the *value* of y (rather than an attribute of its object), it would yield results like the x-code. 
+For example, if the function is altered, val = { x: 10 }; return val;, it will return { x: 9 } */

Week3/homework/step3-bonus.js

@@ -3,8 +3,10 @@
 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);
+ const newArray = arr.filter(function(index, current) {
+ return arr.indexOf(index) === current;
+ });
+ return newArray;
 }
 
 const uniqueValues = makeUnique(values);

Week3/homework/step3.js

@@ -1,14 +1,17 @@
 'use strict';
 
 function createBase(base) {
- // Replace this comment and the next line with your code
- console.log(base);
+ return function(number) {
+ return number + base;
+ };
 }
 
 const addSix = createBase(6);
+const addSeven = createBase(7);
 
 console.log(addSix(10)); // returns 16
 console.log(addSix(21)); // returns 27
+console.log(addSeven(21)); // returns 28
 
 // Do not change or remove anything below this line
 module.exports = createBase;