js2 homework for week3 submission

hnnhack · hnnhack · commit b2e24e9a3dea · 2019-07-16T22:07:13.000+02:00
diff --git a/Week3/homework/step2-1.js b/Week3/homework/step2-1.js
@@ -3,7 +3,7 @@
 function foo(func) {
   // What to do here?
   // Replace this comment and the next line with your code
-  console.log(func);
+  return func();
 }
 
 function bar() {
diff --git a/Week3/homework/step2-2.js b/Week3/homework/step2-2.js
@@ -2,19 +2,29 @@
 
 function threeFive(startIndex, stopIndex, threeCallback, fiveCallback) {
   const numbers = [];
-
   // Replace this comment and the next line with your code
+  for (let i = startIndex; i <= stopIndex; i++) {
+    numbers.push(i);
+    if (i % 15 === 0) {
+      threeCallback(i);
+      fiveCallback(i);
+    } else if (i % 5 === 0) {
+      fiveCallback(i);
+    } else if (i % 3 === 0) {
+      threeCallback(i);
+    }
+  }
   console.log(startIndex, stopIndex, threeCallback, fiveCallback, numbers);
 }
 
 function sayThree(number) {
   // Replace this comment and the next line with your code
-  console.log(number);
+  console.log(number + ' is divisible by 3');
 }
 
 function sayFive(number) {
   // Replace this comment and the next line with your code
-  console.log(number);
+  console.log(number + ' is divisible by 5');
 }
 
 threeFive(10, 15, sayThree, sayFive);
diff --git a/Week3/homework/step2-3.js b/Week3/homework/step2-3.js
@@ -6,9 +6,13 @@ function repeatStringNumTimesWithFor(str, num) {
   let result = '';
 
   // Replace this comment and the next line with your code
-  console.log(str, num, result);
-
-  return result;
+  if (num > 0) {
+    for (let i = 0; i < num; i++) {
+      result += str;
+    }
+    return result;
+  }
+  return '';
 }
 
 console.log('for', repeatStringNumTimesWithFor('abc', 3));
@@ -19,8 +23,10 @@ function repeatStringNumTimesWithWhile(str, num) {
   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;
 }
 
@@ -32,8 +38,10 @@ function repeatStringNumTimesWithDoWhile(str, num) {
   let result = '';
 
   // Replace this comment and the next line with your code
-  console.log(str, num, result);
-
+  do {
+    result += str;
+    num--;
+  } while (num > 0);
   return result;
 }
 
diff --git 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 = 'Johnny';
+  this.color = 'whiite';
+  this.numLegs = 4;
 }
 
 const hound = new Dog();
diff --git a/Week3/homework/step2-5.js b/Week3/homework/step2-5.js
@@ -5,8 +5,11 @@ function multiplyAll(arr) {
   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];
+    }
+  }
   return product;
 }
 
diff --git a/Week3/homework/step2-6.js b/Week3/homework/step2-6.js
@@ -5,12 +5,26 @@ 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 flattenedArr = [];
+  for (let i = 0; i < arr.length; i++) {
+    for (let j = 0; j < arr[i].length; j++) {
+      flattenedArr.push(arr[i][j]);
+    }
+  }
+  return flattenedArr;
 }
 
 function flattenArray3d(arr) {
   // Replace this comment and the next line with your code
-  console.log(arr);
+  const flattenedArr = [];
+  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++) {
+        flattenedArr.push(arr[i][j][k]);
+      }
+    }
+  }
+  return flattenedArr;
 }
 
 console.log(flattenArray2d(arr2d)); // -> [1, 2, 3, 4, 5, 6]
diff --git a/Week3/homework/step2-7.js b/Week3/homework/step2-7.js
@@ -21,3 +21,5 @@ f2(y);
 console.log(y);
 
 // Add your explanation as a comment here
+// JavaScript is call by value.
+// However, in case if object, the value being passed is the reference.
diff --git a/Week3/homework/step3-bonus.js b/Week3/homework/step3-bonus.js
@@ -4,7 +4,8 @@ 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 uniqueArray = arr.filter((item, pos) => arr.indexOf(item) === pos);
+  return uniqueArray;
 }
 
 const uniqueValues = makeUnique(values);
diff --git a/Week3/homework/step3.js b/Week3/homework/step3.js
@@ -2,7 +2,9 @@
 
 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);

Original file line number	Diff line number	Diff line change
`@@ -3,7 +3,7 @@`
`3`	`3`	`function foo(func) {`
`4`	`4`	`// What to do here?`
`5`	`5`	`// Replace this comment and the next line with your code`
`6`		`- console.log(func);`
	`6`	`+ return func();`
`7`	`7`	`}`
`8`	`8`
`9`	`9`	`function bar() {`
Original file line number	Diff line number	Diff line change
`@@ -1,7 +1,9 @@`
`1`	`1`	`'use strict';`
`2`	`2`
`3`	`3`	`function Dog() {`
`4`		`- // add your code here`
	`4`	`+ this.name = 'Johnny';`
	`5`	`+ this.color = 'whiite';`
	`6`	`+ this.numLegs = 4;`
`5`	`7`	`}`
`6`	`8`
`7`	`9`	`const hound = new Dog();`
Original file line number	Diff line number	Diff line change
`@@ -4,7 +4,8 @@ const values = ['a', 'b', 'c', 'd', 'a', 'e', 'f', 'c'];`
`4`	`4`
`5`	`5`	`function makeUnique(arr) {`
`6`	`6`	`// Replace this comment and the next line with your code`
`7`		`- console.log(arr);`
	`7`	`+ const uniqueArray = arr.filter((item, pos) => arr.indexOf(item) === pos);`
	`8`	`+ return uniqueArray;`
`8`	`9`	`}`
`9`	`10`
`10`	`11`	`const uniqueValues = makeUnique(values);`
Original file line number	Diff line number	Diff line change
`@@ -2,7 +2,9 @@`
`2`	`2`
`3`	`3`	`function createBase(base) {`
`4`	`4`	`// Replace this comment and the next line with your code`
`5`		`- console.log(base);`
	`5`	`+ return function(number) {`
	`6`	`+ return number + base;`
	`7`	`+ };`
`6`	`8`	`}`
`7`	`9`
`8`	`10`	`const addSix = createBase(6);`