exam completed alvi

problems/countNumbers.js

@@ -12,8 +12,20 @@
  * returns { 99: 2, 11: 1, 12: 1, 13: 1, 58: 1 }
  */
 
-function countNumbers() {
-
+function countNumbers(arr) {
+    let obj = {}
+    for (let i = 0; i < arr.length; i++){
+        //varriable = arr[i]
+        if(obj[arr[i]]){
+            obj[arr[i]] += 1
+        }
+        else { 
+            obj[arr[i]] = 1
+        }
+    }
+
+   return obj
+
 }
 
 

problems/getCountriesSortedByPopulation.js

@@ -10,8 +10,13 @@
 * 
 */
 
-function getCountriesSortedByPopulation() {
-
+function getCountriesSortedByPopulation(arr) {
+  let newArr = []
+arr.sort((a,b) => b.population - a.population)
+for(let i =0; i < arr.length; i++){
+    newArr.push(arr[i].country)
+}    
+ return newArr
 }
 
 module.exports = getCountriesSortedByPopulation

problems/isOdd.js

@@ -9,8 +9,15 @@
 * ex: isOdd(75); // true
 */
 
-function isOdd() {
+function isOdd(n) {
+    if (n % 2 !== 0){
+        return true
+    }
+    else {
+        return false
+    }
 
 }
+console.log(isOdd(0))
 
 module.exports = isOdd

problems/numberOfDigits.js

@@ -7,8 +7,14 @@
 
 */
 
-function numberOfDigits() {
-
+function numberOfDigits(n) {
+count = 0
+ let stringNum = n.toString()
+ let arrNum = stringNum.split("")
+for (i=0; i < arrNum.length; i ++){
+     count ++
 }
-
+return count
+}
+console.log(numberOfDigits(442135))
 module.exports = numberOfDigits

problems/removeEvenStrings.js

@@ -19,8 +19,14 @@
 * returns: []
 */
 
-function removeEvenStrings() {
-
+function removeEvenStrings(arr) {
+    newArr = []
+    for( i = 0; i < arr.length; i++){
+        if( arr[i].length % 2 !== 0){
+            newArr.push(arr[i])   
+        } 
+    }
+return newArr
 }
 
 module.exports = removeEvenStrings

problems/removeNumbersAtOddIndices.js

@@ -10,8 +10,15 @@
 * ex: removeNumbersAtOddIndices([5, 4, 3, 2, 1]);
 * returns: [5, 3, 1]
 */
-function removeNumbersAtOddIndices() {
+function removeNumbersAtOddIndices(arr) {
+let newArr = []
+    for(i = 0; i < arr.length ; i++){
+        if (i % 2 === 0){
+            newArr.push(arr[i])
+        }
 
+    }
+return newArr
 }
 
 module.exports = removeNumbersAtOddIndices

problems/removeOddNumbers.js

@@ -14,8 +14,17 @@
 * ex: removeOddNumbers([2, 4, 6])
 * returns: [2, 4, 6]
 */
-function removeOddNumbers() {
+function removeOddNumbers(arr) {
+newArr = []
 
+   for(i = 0; i < arr.length; i++) {
+  if(arr[i] % 2 === 0){
+      newArr.push(arr[i])
+
+  }
+
+   }
+   return newArr
 }
 
 module.exports = removeOddNumbers

problems/removeVowels.js

@@ -14,8 +14,13 @@
 *
 */
 
-function removeVowels() {
+function removeVowels(str) {
+    var vowels = ['a', 'e', 'i', 'o', 'u','A','E','I','O','U'];
 
+    return str.split('').filter(function(el) {
+      return vowels.indexOf(el.toLowerCase()) == -1;
+    }).join('');
 }
+console.log(removeVowels("HELLO"))
 
 module.exports = removeVowels

problems/sevenBoom.js

@@ -11,8 +11,17 @@
 * 17 is also replaced with 'BOOM' because it contains a 7.
 */
 
-function sevenBoom() {
-
+function sevenBoom(n) {
+    let number = []
+    for (i=1; i<=n; i++) {
+        if(i % 7 === 0 || i % 10 === 7){
+            number.push('BOOM')
+        }
+        else {
+            number.push(i)
+        }
+    }
+return number
 }
 
 module.exports = sevenBoom

problems/smallest.js

@@ -14,8 +14,14 @@
 * returns 1 (does not matter if it is the first or second 1)
 */
 
-function smallest() {
-
+function smallest(arr) {
+  let s = arr[0]
+  for(let i = 0; i < arr.length; i ++){
+      if(arr[i] < s) {
+          s = arr[i]
+      }
+  }
+  return s // REMEMBER TO RETURN DARN IT 
 }
 
 module.exports = smallest