Lesson 26: Understanding Promises in JavaScript

Lesson Overview

In this lesson, we will learn about Promises in JavaScript, how they work, and how to use them to handle asynchronous operations.

Graphical Preview

This is where a graphical preview of the lesson will be displayed.

Code Example


const myPromise = new Promise((resolve, reject) => {
    const success = true; // Simulating success or failure
    if (success) {
        resolve("Promise resolved successfully!");
    } else {
        reject("Promise rejected!");
    }
});

myPromise
    .then(result => console.log(result))
    .catch(error => console.log(error));

Lesson 26: Understanding Promises in JavaScript

Lesson Overview

In this lesson, we will learn about Promises in JavaScript, how they work, and how to use them to handle asynchronous operations.

Graphical Preview

This is where a graphical preview of the lesson will be displayed.

Code Example


const myPromise = new Promise((resolve, reject) => {
    const success = true; // Simulating success or failure
    if (success) {
        resolve("Promise resolved successfully!");
    } else {
        reject("Promise rejected!");
    }
});

myPromise
    .then(result => console.log(result))
    .catch(error => console.log(error));
`; const blob = new Blob([htmlContent], { type: 'text/html' }); const url = URL.createObjectURL(blob); const a = document.createElement('a'); a.href = url; a.download = 'lesson26.html'; a.click(); URL.revokeObjectURL(url); }); document.getElementById('download-js').addEventListener('click', function() { const jsContent = `const myPromise = new Promise((resolve, reject) => { const success = true; // Simulating success or failure if (success) { resolve("Promise resolved successfully!"); } else { reject("Promise rejected!"); } }); myPromise .then(result => console.log(result)) .catch(error => console.log(error));`; const blob = new Blob([jsContent], { type: 'application/javascript' }); const url = URL.createObjectURL(blob); const a = document.createElement('a'); a.href = url; a.download = 'lesson26.js'; a.click(); URL.revokeObjectURL(url); });