Assignments week 1

01-js/easy/anagram.js

@@ -8,7 +8,12 @@
 */
 
 function isAnagram(str1, str2) {
-
+  console.log(
+    str1.split("").sort().join("") === str2.split("").sort().join("")
+      ? true
+      : false
+  );
 }
 
+isAnagram("bat", "tb");
 module.exports = isAnagram;

01-js/easy/expenditure-analysis.js

@@ -7,9 +7,50 @@
   Once you've implemented the logic, test your code by running
   - `npm run test-expenditure-analysis`
 */
+const items = [
+  {
+    itemName: "Mobile Phone",
+    category: "Electronics",
+    price: 100,
+    timestamp: Date.now(),
+  },
+  {
+    itemName: "Shirt1",
+    category: "Cloths",
+    price: 500,
+    timestamp: Date.now(),
+  },
+  {
+    itemName: "Shirt2",
+    category: "Cloths",
+    price: 1100,
+    timestamp: Date.now(),
+  },
+  {
+    itemName: "Bed",
+    category: "Furniture",
+    price: 200,
+    timestamp: Date.now(),
+  },
+];
 
 function calculateTotalSpentByCategory(transactions) {
-  return [];
+  const cateoryTotalAmount = {};
+
+  transactions.forEach((transaction) => {
+    const { category, price } = transaction;
+    if (cateoryTotalAmount[category]) {
+      cateoryTotalAmount[category] += price;
+    } else {
+      cateoryTotalAmount[category] = price;
+    }
+  });
+
+  return Object.keys(cateoryTotalAmount).map((category) => ({
+    [category]: cateoryTotalAmount[category],
+  }));
 }
 
+console.log(calculateTotalSpentByCategory(items));
+
 module.exports = calculateTotalSpentByCategory;

01-js/hard/calculator.js

@@ -17,6 +17,12 @@
   - `npm run test-calculator`
 */
 
-class Calculator {}
+class Calculator {
+  constructor(result) {
+    this.result = result;
+  }
+
+
+}
 
 module.exports = Calculator;

01-js/medium/palindrome.js

@@ -7,7 +7,10 @@
 */
 
 function isPalindrome(str) {
-  return true;
+  str = str.toLowerCase();
+  return str === str.split("").reverse().join("");
 }
 
+console.log(isPalindrome("Hannah"));
+
 module.exports = isPalindrome;

01-js/medium/times.js

@@ -7,6 +7,21 @@ Try running it for
 Hint - use Date class exposed in JS
 */
 
+const s = new Date();
+let sec = s.getSeconds();
+
 function calculateTime(n) {
-    return 0.01;
-}
+  let start = new Date().getTime();
+
+  let sum = 0;
+  for (let i = 1; i <= n; i++) {
+    sum += i;
+  }
+  console.log(sum);
+
+  let end = new Date().getTime();
+  let time = (end - start) / 1000;
+  return time;
+}
+
+console.log(calculateTime(10000));

02-async-js/easy/counter.js

@@ -0,0 +1,8 @@
+let counter = 0;
+
+function setCounter() {
+  console.clear();
+  counter++;
+  console.log(counter);
+}
+setInterval(setCounter, 1000);

02-async-js/easy/counter2.js

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

02-async-js/easy/readfile.js

@@ -0,0 +1,6 @@
+const fs = require("fs");
+
+fs.readFile("./text.txt", "utf8", (err, data) => {
+  if (err) throw err;
+  console.log(data);
+});

02-async-js/easy/writefile.js

@@ -0,0 +1,6 @@
+const fs = require("fs");
+
+fs.writeFile("./text.txt", "This is the change", "utf8", (err) => {
+  if (err) throw err;
+  console.log("done");
+});

02-async-js/medium/clock.js

@@ -0,0 +1,23 @@
+function printTime() {
+  var time = new Date();
+  var format = time.getHours() > 12 ? "PM" : "AM";
+
+  var hours = time.getHours();
+  hours = hours > 12 ? hours - 12 : hours;
+
+  var mintue = time.getMinutes();
+  mintue = mintue < 10 ? "0" + mintue : mintue;
+
+  var sec = time.getSeconds();
+  sec = sec < 10 ? "0" + sec : sec;
+
+  const ans = hours + ":" + mintue + ":" + sec + " " + format;
+  console.log(ans);
+}
+
+function clock() {
+  console.clear();
+  printTime();
+}
+
+setInterval(clock, 1000);

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

@@ -0,0 +1,31 @@
+// ## File cleaner
+// Read a file, remove all the extra spaces and write it back to the same file.
+
+// For example, if the file input was
+// ```
+// hello     world    my    name   is       raman
+// ```
+
+// After the program runs, the output should be
+
+// ```
+// hello world my name is raman
+// ```
+
+const fs = require("fs");
+
+function clean(data) {
+  data = data.replace(/\s+/g, " ").trim();
+  return data;
+}
+
+fs.readFile("./text.txt", "utf8", (err, data) => {
+  if (err) console.log(err);
+  data = clean(data);
+  //   console.log(data);
+
+  fs.writeFile("./text.txt", data, "utf8", (err) => {
+    if (err) console.log(err);
+    console.log(data);
+  });
+});

02-async-js/medium/text.txt

@@ -0,0 +1 @@
+asda asd d ads as asd as dadasd