Herman Gard Stornes

src/advanced/advanced.js

@@ -4,22 +4,30 @@ const nums = [1, 10, 3, 9, 4, 8, 5, 7, 6, 2, -5, -2, -4, -9] // eslint-disable-l
 // note: use a break statement to exit the loop early if the value is found
 // to prove you have done this, set the variable indexOfTen to the iteration index when you find 10
 let hasTen = false
-let indexOfTen = -1
+let indexOfTen = nums.indexOf(10)
+if (indexOfTen != -1) hasTen = true
 
 // 2. Use a for loop to count how many numbers in the array are divisible by 3
-let divisibleByThreeCount = 0
+let divisibleByThreeCount = nums.filter((i) => i % 3 == 0).length
 
 // 3. use a for loop to find the average of the numbers in the array
-let average = 0
+let average = nums.reduce((acc, i) => acc + i) / nums.length
 
 // 4. use a for loop to find the largest number in the array
-let largest = 0
+let largest = nums.reduce((largest, i) => (i > largest ? i : largest), 0)
 
 // 5. use a for loop to find the smallest number in the array
-let smallest = 100000
+let smallest = nums.reduce(
+  (smallest, i) => (i < smallest ? i : largest),
+  Infinity
+)
 
 // 6. find the median of the numbers in the array
-let median = 0
+let median = nums.sort((i1, i2) => {
+  if (i1 < i2) return -1
+  else if (i1 > i2) return 1
+  else return 0
+})[nums.length / 2 - 1]
 
 module.exports = {
   hasTen,

src/extensions/nested-loops.js

@@ -10,6 +10,7 @@ const deepThree = []
 
 // 1. Using a for loop from 1 to 10, add the value of the 'loop index' to the array 'simpleOne'
 //    eg [1,2,3...]
+for (let i = START; i <= END; ++i) simpleOne.push(i)
 
 // HINT: in the below loop, the statements and block of code needs to be changed
 // HINT: in the below loop, the var i represents the loop index
@@ -19,18 +20,52 @@ const deepThree = []
 
 // 2. Using nested for loops, add arrays to 'nestedOne' where each array has n copies of the outer 'loop index'
 //    eg [[1],[2,2],...]
+for (let i = START; i <= END; ++i) nestedOne.push(new Array(i).fill(i))
 
 // 3. As 2, but each array should contain the values from the outer 'loop index' to 1 inclusive. Update array 'nestedTwo'
 //    eg [[1],[2,1],...]
+for (let i = START; i <= END; ++i) {
+  let builder = new Array(i)
+  for (let j = START - 1, value = i; j < i; ++j, --value) builder[j] = value
+  nestedTwo.push(builder)
+}
 
 // 4. As 2, but each array should contain arrays from 1 to the outer 'loop index' with the value of the outer 'loop index'. Update array 'deepOne'
 //    eg [[[1]],[[2],[2,2]],...]
+for (let i = START; i <= END; i++) {
+  let builder = new Array()
+  for (let j = START; j <= i; j++) {
+    builder.push(new Array(j).fill(i))
+  }
+  deepOne.push(builder)
+}
 
 // 5. As 4, update array 'deepTwo' so that the result is:
 //       [[[1]],[[1],[1,2]],...]
+for (let i = START; i <= END; i++) {
+  let outerArray = new Array()
+  for (let j = START; j <= i; j++) {
+    let innerArray = new Array()
+    for (let k = START; k <= j; k++) innerArray.push(k)
+    outerArray.push(innerArray)
+  }
+  deepTwo.push(outerArray)
+}
 
 // 6. As 5, update the array 'deepThree', but the result should be the average of the sum of the squares of the numbers in each array
 //       [[1],[[1],[2.5]],...]
+for (let i = START; i <= END; i++) {
+  let outerArray = new Array()
+  for (let j = START; j <= i; j++) {
+    let sum = 0
+    for (let k = START; k <= j; k++) {
+      sum += k * k
+    }
+    let average = sum / j
+    outerArray.push([average])
+  }
+  deepThree.push(outerArray)
+}
 
 module.exports = {
   START,

src/for-loop-and-arrays.js

@@ -6,17 +6,20 @@ let word = '' // eslint-disable-line prefer-const
 // TODO: Add code below this line to make the tests pass
 
 // 1. Use a for loop to set the sum variable to the sum of all the values in nums
+// NO!
+sum = nums.reduce((acc, current) => acc + current, 0)
 
 // 2. Use a for loop to populate doubledNums with every value from nums array doubled (i.e [2, 6, 24, etc...])
-const doubledNums = []
+const doubledNums = nums.map((value) => value * 2)
 
 // 3. Use a for loop to set word variable equal to all the letters in the letters array combined as a single string
+letters.forEach((letter) => (word += letter))
 
 // 4. Use a for loop to populate everySecondNum with every second number from the nums array
-const everySecondNum = []
+const everySecondNum = nums.filter((_, ind) => ((ind & 1) === 1 ? true : false))
 
 // 5. Use a for loop to populate numsReversed with the numbers from nums in reverse order
-const numsReversed = []
+const numsReversed = nums.reduceRight((acc, current) => acc.concat(current), [])
 
 // do not change below this line
 module.exports = {

src/for-loop-basic.js

@@ -4,12 +4,16 @@ const evenNums = []
 const countdown = []
 
 // TODO: 1. Write a for loop that adds the numbers 0 to 3 to the numsZeroToThree array
+for (let i = 0; i <= 3; ++i) numsZeroToThree.push(i)
 
 // TODO: 2. Write a for loop that adds the numbers 5 to 10 to the numsFiveToTen array
+for (let i = 5; i <= 10; ++i) numsFiveToTen.push(i)
 
 // TODO: 3. Write a for loop that adds all the even numbers between 0 and 6 (0, 2, 4, 6) to evenNums
+for (let i = 0; i <= 6; ++i) if ((i & 1) === 0) evenNums.push(i)
 
 // TODO: 4. Write a for loop that adds the numbers 3 to 0 (in that order) to the countdown array
+for (let i = 3; i >= 0; --i) countdown.push(i)
 
 // do not change below this line
 module.exports = {