easy and medium assignments done

01-js/easy/anagram.js

@@ -8,7 +8,17 @@
 */
 
 function isAnagram(str1, str2) {
-
+  var str1LowerCase = str1.toLowerCase();
+  var str2LowerCase = str2.toLowerCase();
+  if(str1LowerCase.split("").sort().join("") == str2LowerCase.split("").sort().join("")){ 
+    return true;                                                        
+  }                                                                     
+  else{                                                                 
+    return false;
+  }
 }
 
-module.exports = isAnagram;
+var ans = isAnagram("rasp","pasr");
+console.log(ans);
+
+module.exports = isAnagram;

01-js/easy/expenditure-analysis.js

@@ -9,7 +9,33 @@
 */
 
 function calculateTotalSpentByCategory(transactions) {
-  return [];
+  var spendEstimates = {};
+
+  for(var i = 0; i < transactions.length; i++){
+    var t = transactions[i];
+
+    if(spendEstimates[t.category]){
+      spendEstimates[t.category] = spendEstimates[t.category] + t.price;
+    }
+    else{
+      spendEstimates[t.category] = t.price;
+    }
+  }
+
+  var keys = Object.keys(spendEstimates);
+
+  let answer = [];
+  for(var i = 0; i < keys.length; i++){
+    var category = keys[i];
+    var obj = {
+      category: category,
+      totalSpent: spendEstimates[category]
+    }
+    answer.push(obj);
+  }
+
+  console.log(answer);
+  return answer;
 }
 
-module.exports = calculateTotalSpentByCategory;
+module.exports = calculateTotalSpentByCategory;

01-js/medium/palindrome.js

@@ -6,8 +6,45 @@
   - `npm run test-palindrome`
 */
 
+function reverse(str){
+  var answer = "";
+  for(let i = str.length - 1;i >= 0; i--){
+    answer += str[i];
+  }
+  return answer;
+}
+
+function transform(str){
+  var answer = "";
+  for(let i = 0; i < str.length; i++){
+    if(str[i] == " " || str[i] == "?" || str[i] == "!" || str[i] == "," || str[i] == "."){
+
+    }
+    else{
+      answer += str[i];
+    }
+  }
+  return answer;
+}
+
 function isPalindrome(str) {
-  return true;
+  str = str.toLowerCase();
+  str = transform(str);
+  var reverseString = reverse(str);
+  reverseString = reverseString.toLowerCase();
+
+  if(str == reverseString){
+    return true;
+  }
+  else{
+    return false;
+  }
 }
 
-module.exports = isPalindrome;
+var str1 = "race car";
+var str2 = "jill";
+
+console.log(isPalindrome(str1));
+console.log(isPalindrome(str2));
+
+module.exports = isPalindrome;

01-js/medium/times.js

@@ -8,5 +8,15 @@ Hint - use Date class exposed in JS
 */
 
 function calculateTime(n) {
-    return 0.01;
-}
+    let startTime = new Date().getTime();
+    let sum = 0;
+    for(let i = 1; i < n; i++){
+        sum += i;
+    }
+    let endTime = new Date().getTime();
+    console.log((endTime - startTime) / 1000);
+}
+
+calculateTime(100);
+calculateTime(100000);
+calculateTime(1000000000);

02-async-js/easy/1-counter.js

@@ -0,0 +1,9 @@
+var counter = 1;
+
+function increaseCount(){
+    console.clear();
+    counter += 1;
+    console.log(counter);
+}
+
+setInterval(increaseCount, 1000);

02-async-js/easy/2-counter.js

@@ -0,0 +1,10 @@
+var counter = 0;
+
+function increaseCount(){
+    console.clear();
+    counter += 1;
+    console.log(counter);
+    setTimeout(increaseCount, 1000);
+}
+
+setTimeout(increaseCount, 1000);

02-async-js/easy/3-read-from-file.js

@@ -0,0 +1,14 @@
+const fs = require('fs');
+
+fs.readFile('./sample-text.txt', 'utf-8', (err, data) => {
+    if(err){
+        console.error(err);
+        return;
+    }
+    console.log(data);
+});
+
+var counter = 0;
+for(var i = 0; i < 10000000; i++){
+    counter += 1;
+}

02-async-js/easy/4-write-to-file.js

@@ -0,0 +1,9 @@
+const fs = require('fs');
+
+fs.writeFile('sample-text.txt','This is some sample data to write to the file.','utf8', (err) => {
+    if(err){
+        console.error(err);
+        return;
+    }
+    console.log('File has been written');
+});

02-async-js/easy/sample-text.txt

@@ -0,0 +1 @@
+This is some sample data to write to the file.

02-async-js/medium/1-file-cleaner.js

@@ -0,0 +1,27 @@
+const fs = require('fs');
+
+fs.readFile('./temp-file.txt','utf8', (err,data) => {
+    if(err){
+        console.error(err);
+        return;
+    }
+    console.log(data);
+
+    function clean(data){
+        var arr = data.split(" ").filter(x => x!='');
+        var newData = arr.join(" ");
+        return newData;
+    };
+
+    const writeData = clean(data);
+
+    fs.writeFile('./temp-file.txt', writeData, 'utf8', (err) => {
+        if(err){
+            console.error(err);
+            return;
+        }
+        else{
+            console.log("File has been written successfully!");
+        }
+    });
+});

02-async-js/medium/2-clock.js

@@ -0,0 +1,45 @@
+//HH:MM::SS (Eg. 13:45:23) format
+
+function printTime(){
+    console.clear();
+
+    let currentDate = new Date();
+    const answer = `${currentDate.getHours()}:${currentDate.getMinutes()}:${currentDate.getSeconds()}`;
+    console.log(answer);
+}
+
+setInterval(printTime, 1000);
+
+//HH:MM::SS AM/PM (Eg 01:45:23 PM) format
+
+function printTime(){
+    console.clear();
+
+    let currentDate = new Date();
+
+    const sec = currentDate.getSeconds();
+    const min = currentDate.getMinutes();
+    const hour = () => {
+        currentDate.getHours();
+        if(currentDate.getHours() > 12){
+            return (currentDate.getHours() - 12);
+        }
+        else{
+            return currentDate.getHours();
+        }
+    }
+
+    const amOrPm = () => {
+        if(currentDate.getHours() > 12){
+            return "PM";
+        }
+        else{
+            return "AM";
+        }
+    }
+
+    console.log(`${hour()}:${min}:${sec} ${amOrPm()}`);
+    setTimeout(printTime,1000);
+}
+
+setTimeout(printTime,1000);

02-async-js/medium/temp-file.txt

@@ -0,0 +1 @@
+hello world my name is varshaa