solution

Author: Drago

01-js/easy/anagram.js

@@ -4,8 +4,30 @@
   - A word, phrase, or name formed by rearranging the letters of another, such as spar, formed from rasp.
 */
 
-function isAnagram(str1, str2) {
+function isAnagram(str1, str2){
+  let sizeStr1 = str1.length;
+  let sizeStr2 = str2.length;
 
+  if(sizeStr1 !== sizeStr2){
+    return false;
+  }
+
+  let arr1 = str1.toLowerCase();
+  let arr2 = str2.toLowerCase();
+  
+  let char1 = arr1.split('');
+  let char2 = arr2.split('');
+  
+  char1.sort();
+  char2.sort();
+  
+
+  for(let i = 0; i < sizeStr1; i++){
+    if(char1[i] !== char2[i]){
+      return false;
+    }
+  }
+  return true;
 }
 
 module.exports = isAnagram;

01-js/easy/expenditure-analysis.js

@@ -14,7 +14,26 @@
 */
 
 function calculateTotalSpentByCategory(transactions) {
-  return [];
-}
 
-module.exports = calculateTotalSpentByCategory;
+  const categoryTotal = {};
+
+  transactions.forEach(function(transaction){
+    const {category, price} = transaction;
+
+    if(!categoryTotal[category]){
+      categoryTotal[category] = price;
+    }
+    else{
+      categoryTotal[category] += price;
+    }
+  });
+
+  const res = Object.keys(categoryTotal).map(category=>({
+    category,
+    totalSpent : categoryTotal[category],
+  }));
+
+  return res;
+
+}
+module.exports = calculateTotalSpentByCategory;

01-js/easy/findLargestElement.js

@@ -6,7 +6,12 @@
 */
 
 function findLargestElement(numbers) {
-    
+    let largest = numbers[0];
+    for(let i = 0;i < numbers.length ;i++){
+        if(numbers[i] > largest)
+            largest=numbers[i];
+    }
+    return largest;
 }
 
 module.exports = findLargestElement;

01-js/hard/calculator.js

@@ -17,5 +17,5 @@
 */
 
 class Calculator {}
-
+ 
 module.exports = Calculator;

01-js/medium/countVowels.js

@@ -6,7 +6,14 @@
 */
 
 function countVowels(str) {
-    // Your code here
+   let char=str.toLowerCase();
+   let count=0;
+   for(let i=0;i<str.length;i++){
+    if(char[i]=='a' || char[i]=='e' || char[i]=='i' || char[i]=='o' || char[i]=='u'){
+      count++;
+    }
+   }
+   return count;
 }
 
 module.exports = countVowels;

01-js/medium/palindrome.js

@@ -3,8 +3,45 @@
   Note: the input string is case-insensitive which means 'Nan' is a palindrom as 'N' and 'n' are considered case-insensitive.
 */
 
-function isPalindrome(str) {
+function valid(ch){
+  if(ch>='a' && ch<='z' || ch>='A' && ch<='Z' || ch<=9 && ch>=1){
+    return true;
+  }
+  return false;
+}
+
+
+function palindrom(newStr){
+  let start=0;
+  let end=newStr.length-1;
+
+  while(start<=end){
+    if(newStr[start]!==newStr[end]){
+      return false;
+    }
+    else{
+      start++;
+      end--;
+    }
+  }
   return true;
 }
 
+//given function
+function isPalindrome(str) {
+  //remove faltu characters
+  let newStr="";
+
+  for(let i=0;i<str.length;i++){
+    if(valid(str[i])){
+      newStr += str[i];
+    }
+  }
+
+  let ch1=newStr.toLowerCase();
+
+
+  return palindrom(ch1);
+}
+
 module.exports = isPalindrome;

01-js/medium/times.js

@@ -9,5 +9,6 @@ There is no automated test for this one, this is more for you to understand time
 */
 
 function calculateTime(n) {
+    
     return 0.01;
 }