week2 vid1

Author: INDRESH-009

js_notes/cohertnotes/week1/10. async.js

@@ -106,4 +106,21 @@ console.log("Code ends");
 //   2.5) Using .then() we can control when we call the cb(callback) function.
 
 // 3. To avoid callback hell (Pyramid of doom) => We use promise chaining. This way our code expands vertically instead of horizontally. Chaining is done using '.then()'
-// 4. A very common mistake that developers do is not returning a value during chaining of promises. Always remember to return a value. This returned value will be used by the next .then()
+// 4. A very common mistake that developers do is not returning a value during chaining of promises. Always remember to return a value. This returned value will be used by the next .then()
+
+
+const inventory = {
+    sunglass : 120,
+    pants : 24,
+    shirts : 40,
+}
+const stockchecker = (resolve,reject) => {
+    if(inventory.sunglass > 0){
+        resolve("Sunglasses are available");
+    }
+    else{
+        reject("Sunglasses are out of stock");
+    }
+}
+const mypromise = new Promise(stockchecker);
+console.log(mypromise);

js_notes/cohertnotes/week1/promise.js

@@ -0,0 +1,32 @@
+//High level difference between the syntax of asynchronous javascript 
+//1. Callbacks 
+//2. Promises 
+//3. Async / awaits 
+
+//without callbacks - function is not passed as a parameter
+function square(n){
+    return n*n;
+}
+function cube(n){
+    return n*n*n;
+}
+function sumofsquare(a,b){
+    let square1 = square(a);
+    let square2 = square(b);
+    return square1+square2;
+}
+console.log(sumofsquare(3,4));
+
+//using callbacks - function is passed as a parameter
+function square(n){
+    return n*n;
+}
+function cube(n){
+    return n*n*n;
+}
+function ans(a,b,operation){
+    let x = operation(a);
+    let y = operation(b);
+    console.log(x+y);
+}
+ans(1,2,cube);