Promise Sort Assignment Solution 2

javascript/02/closures.js

@@ -16,7 +16,7 @@ console.log(c1(), c1(), c1())
 console.log(c2(), c2(), c2())
 console.log(c1(), c1(), c1())
 
-
+// Shadowing of variables
 function a () {
   let x = 10
   let p = 1

javascript/02/practice.js

@@ -0,0 +1,30 @@
+// If the object binded to the function is changed inside the function, then does it also chenge in main code. ans: Yes 
+
+console.log(this) // blank object
+
+function fun1() {
+    this.a = "lavde"
+    console.log(this) // globalThis
+}
+
+let obj2 = {
+    a: "hell",
+    b:10,
+    c: true,
+    d: fun1
+}
+
+obj2.d()
+
+let obj = {
+    a: "hello",
+    b: 10,
+    c: true
+}
+
+// let f = fun1.bind(obj);
+// f();
+// fun1.call(obj)
+fun1.apply(obj)
+
+console.log(obj, "Original Object")

javascript/02/spread-rest.js

@@ -0,0 +1,19 @@
+//  Spread operator - Converts array to individual values
+function sumOne(a, b) {
+    return a+b
+}
+
+arr = [5, 4]
+console.log(sumOne(...arr))
+
+// Rest operator - Converts individual values to array
+function calSum(a, b, ...args) {
+    let multi = a*b
+    let sum = 0
+    for (const arg of args) {
+        sum += arg
+    }
+    return [multi, sum]
+}
+
+console.log(calSum(3, 7, 34, 2))

javascript/04/async-assignment/multisort.js

@@ -11,3 +11,35 @@ const fs = require('fs')
  * 
  * NOTE: You can NOT use readFileSync or writeFileSync 
  */
+
+const fileNames = ['/1.txt', '/2.txt', '/3.txt']
+const arrOfPromises = []
+
+function mergeAllIntoOne(arrs) {
+    let ans = [];
+    arrs.forEach(element => {
+        ans = [...ans, ...element]
+    });
+    ans.sort((a, b) => a - b);
+    return (ans);
+}
+
+fileNames.forEach(filename => {
+    let promise = new Promise((resolve, reject) => {
+        fs.readFile(__dirname + filename, function (err, data) {
+            if (err) throw err;
+            let array = data.toString().split("\n");
+            var numberArray = array.map(Number);
+            numberArray.sort((a, b) => a - b)
+            resolve(numberArray);
+        })
+    })
+    arrOfPromises.push(promise);
+})
+
+Promise.all(arrOfPromises).then((arrs) => {
+    var file = fs.createWriteStream(__dirname + '/sorted.txt');
+    file.on('error', function (err) { throw err });
+    mergeAllIntoOne(arrs).forEach(function (v) { file.write(v + '\n'); });
+    file.end();
+})