Week-1 Easy and medium done.

01-js/easy/anagram.js

@@ -8,7 +8,10 @@
 */
 
 function isAnagram(str1, str2) {
-
+  let first = str1.toLowerCase().split("").sort().join("");
+  let second = str2.toLowerCase().split("").sort().join("");
+  if (first == second) return true;
+  else return false;
 }
 
 module.exports = isAnagram;

01-js/easy/expenditure-analysis.js

@@ -9,7 +9,22 @@
 */
 
 function calculateTotalSpentByCategory(transactions) {
-  return [];
+  var spent = {};
+  for (let i = 0; i < transactions.length; i++) {
+    if (spent[transactions[i].category]) {
+      spent[transactions[i].category] += transactions[i].price;
+    } else {
+      spent[transactions[i].category] = transactions[i].price;
+    }
+  }
+
+  var keys = Object.keys(spent);
+  var ans = [];
+  for (var i = 0; i < keys.length; i++) {
+    var obj = { category: keys[i], totalSpent: spent[keys[i]] };
+    ans.push(obj);
+  }
+  return ans;
 }
 
 module.exports = calculateTotalSpentByCategory;

01-js/hard/todo-list.js

@@ -12,7 +12,40 @@
 */
 
 class Todo {
+  constructor() {
+    this.todoList = [];
+  }
 
+  add(todo) {
+    this.todoList.push(todo);
+  }
+
+  remove(indexOfTodo) {
+    if (indexOfTodo >= 0 && indexOfTodo < this.todoList.length) {
+      this.todoList.splice(indexOfTodo, 1);
+    }
+  }
+
+  update(index, updatedTodo) {
+    if (index >= 0 && index < this.todoList.length) {
+      this.todoList[index] = updatedTodo;
+    }
+  }
+
+  getAll() {
+    return this.todoList;
+  }
+
+  get(indexOfTodo) {
+    if (indexOfTodo >= 0 && indexOfTodo < this.todoList.length) {
+      return this.todoList[indexOfTodo];
+    }
+    return null;
+  }
+
+  clear() {
+    this.todoList.length = 0;
+  }
 }
 
 module.exports = Todo;

01-js/medium/palindrome.js

@@ -5,9 +5,28 @@
   Once you've implemented the logic, test your code by running
   - `npm run test-palindrome`
 */
+function transform(str) {
+  let ans = "";
+  for (let i = 0; i < str.length; i++) {
+    if (
+      str[i] == "." ||
+      str[i] == " " ||
+      str[i] == "?" ||
+      str[i] == "!" ||
+      str[i] == ","
+    ) {
+    } else {
+      ans += str[i];
+    }
+  }
+  return ans.toLowerCase();
+}
 
 function isPalindrome(str) {
-  return true;
+  let newStr = transform(str);
+  let revstr = newStr.split("").reverse().join("");
+  if (revstr == newStr) return true;
+  else return false;
 }
 
 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 t1 = new Date();
+  let first = t1.getTime();
+  let sum = 0;
+  for (let i = 1; i <= n; i++) {
+    sum += i;
+  }
+  let t2 = new Date();
+  let second = t2.getTime();
+  console.log(second - first + " miliseconds");
+}
+
+calculateTime(10000000);

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

@@ -0,0 +1,5 @@
+let count = 0;
+setInterval(() => {
+  console.clear();
+  console.log(count++);
+}, 1000);

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

@@ -1,4 +1,4 @@
 ## Create a counter in JavaScript
 
 We have already covered this in the second lesson, but as an easy recap try to code a counter in Javascript
-It should go up as time goes by in intervals of 1 second
+It should go up as time goes by in intervals of 1 second

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

@@ -0,0 +1,13 @@
+let count = 0;
+function timer() {
+  setTimeout(() => {
+    console.clear();
+    console.log(count++);
+    timer();
+  }, 1000);
+}
+setTimeout(() => {
+  console.clear();
+  console.log(count++);
+  timer();
+}, 1000);

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

@@ -0,0 +1,13 @@
+const fs = require("node:fs");
+
+fs.readFile("read.txt", "utf-8", (err, data) => {
+  if (err) throw err;
+  else {
+    console.log(data);
+  }
+});
+
+for (let i = 0; i < 10000000000; i++) {
+  let count;
+  count++;
+}

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

@@ -0,0 +1,11 @@
+const fs = require("node:fs");
+
+fs.writeFile(
+  "write.txt",
+  "I am writing to this file using fs lib.",
+  "utf-8",
+  (err, data) => {
+    if (err) throw err;
+    else console.log("File updated");
+  }
+);

02-async-js/easy/abc.txt

@@ -0,0 +1 @@
+Helo Nemo

02-async-js/easy/read.txt

@@ -0,0 +1 @@
+My content is stolen.

02-async-js/easy/write.txt

@@ -0,0 +1 @@
+I am writing to this file using fs lib.

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

@@ -0,0 +1,25 @@
+const fs = require("fs");
+
+function clean(data) {
+  var dataArr = data.split(" ");
+
+  var ans = [];
+  for (let i = 0; i < dataArr.length; i++) {
+    if (dataArr[i].length == 0) {
+    } else {
+      ans.push(dataArr[i]);
+    }
+  }
+  ans = ans.join(" ");
+  return ans;
+}
+
+fs.readFile("clean.txt", "utf-8", (err, data) => {
+  if (err) throw err;
+  var cleanedData = clean(data);
+
+  fs.writeFile("clean.txt", cleanedData, "utf-8", (err, data) => {
+    if (err) throw err;
+    else console.log("file cleaned");
+  });
+});

02-async-js/medium/clean.txt

@@ -0,0 +1 @@
+Helo i need some cleaning .

02-async-js/medium/clock.js

@@ -0,0 +1,7 @@
+setInterval(() => {
+  console.clear();
+  let time = new Date();
+  var answer =
+    time.getHours() + ":" + time.getMinutes() + ":" + time.getSeconds();
+  console.log(answer);
+}, 1000);