done

problems/countNumbers.js

@@ -12,9 +12,21 @@
  * 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++) {  
+
+        let num = arr[i];       
+        obj[num] = obj[num] ? obj[num] + 1 : 1  
+    }   
+    return obj;
 }
+
+
+
+
+
+
 
 
 module.exports = countNumbers

problems/getCountriesSortedByPopulation.js

@@ -10,7 +10,10 @@
 * 
 */
 
-function getCountriesSortedByPopulation() {
+function getCountriesSortedByPopulation(arr) {
+ return arr.sort((a1, a2) => a1.population < a2.population ? 1 :-1).map(el => el.country) 
+
+
 
 }
 

problems/isOdd.js

@@ -9,7 +9,13 @@
 * ex: isOdd(75); // true
 */
 
-function isOdd() {
+function isOdd(n) {
+    if(n % 2 !==0){
+    return true
+
+    }else{
+        return false
+    }
 
 }
 

problems/numberOfDigits.js

@@ -7,7 +7,10 @@
 
 */
 
-function numberOfDigits() {
+function numberOfDigits(n) {
+    let digits = n.toString().length
+    return digits
+
 
 }
 

problems/removeEvenStrings.js

@@ -19,8 +19,16 @@
 * returns: []
 */
 
-function removeEvenStrings() {
-
+function removeEvenStrings(arr) {
+    let newOdd = []
+    for(let i = 0; i < arr.length; i++){
+        if(arr[i].length%2 !==0 ){
+            newOdd.push(arr[i])
+        }
+    }
+       return newOdd 
 }
 
+
+
 module.exports = removeEvenStrings

problems/removeNumbersAtOddIndices.js

@@ -10,7 +10,12 @@
 * ex: removeNumbersAtOddIndices([5, 4, 3, 2, 1]);
 * returns: [5, 3, 1]
 */
-function removeNumbersAtOddIndices() {
+function removeNumbersAtOddIndices(arr) {
+    let index = []
+    for(let i= 0; i < arr.length;i+= 2){
+        index.push(arr[i])
+    }
+    return index
 
 }
 

problems/removeOddNumbers.js

@@ -14,7 +14,14 @@
 * ex: removeOddNumbers([2, 4, 6])
 * returns: [2, 4, 6]
 */
-function removeOddNumbers() {
+function removeOddNumbers(arr) {
+    let newarr = []
+    for(let i =0; i < arr.length; i++){
+        if(arr[i] % 2 ===0){
+            newarr.push(arr[i])
+        }
+    }
+    return newarr
 
 }
 

problems/removeVowels.js

@@ -14,8 +14,14 @@
 *
 */
 
-function removeVowels() {
-
+function removeVowels(str) {
+ let vowel = ""
+  for (let i = 0; i < str.length; i++) {
+    if (str[i] !== 'a' && str[i] !== 'e' && str[i] !== 'i' && str[i] !== 'o' && str[i] !== 'u' && str[i] !== 'A' && str[i] !== 'E' && str[i] !== 'I' && str[i] !== 'O' && str[i] !== 'U') {
+        vowel += str[i]
+    }
+  }
+  return vowel
 }
 
 module.exports = removeVowels

problems/sevenBoom.js

@@ -11,7 +11,16 @@
 * 17 is also replaced with 'BOOM' because it contains a 7.
 */
 
-function sevenBoom() {
+function sevenBoom(n) {
+    let newarr = []
+    for(let i = 1; i <= n; i+= 1){
+        if(i === 7 || i.toString().includes(7)||i % 7 ===0 ){
+            newarr.push("BOOM")
+        }else{
+            newarr.push(i)
+        }    
+    }
+    return newarr
 
 }
 

problems/smallest.js

@@ -14,8 +14,21 @@
 * returns 1 (does not matter if it is the first or second 1)
 */
 
-function smallest() {
-
+// i = 0
+// arr[i] = 3     // small = 3
+// i = 1
+// arr[i] = 0     // small = 0
+
+function smallest(arr) {
+let smallNumber = arr[0]
+for(let i = 0; i < arr.length; i++){
+    if(arr[i] < smallNumber){
+      smallNumber = arr[i]
+    }
+
+}
+return smallNumber
 }
 
 module.exports = smallest
+