Advanced JavaScript

Advanced JavaScript concepts help developers write powerful, reusable and maintainable JavaScript applications.

What is Advanced JavaScript?

Advanced JavaScript refers to concepts that go beyond basic variables, functions, loops and objects. These concepts help developers understand how JavaScript works internally and how to build better applications.

Some important advanced concepts include Scope, Closures, Error Handling and JavaScript best practices.

Example 1: Scope

Scope determines where a variable can be accessed inside a JavaScript program.

let name = "CIIT";

function showName() {

    let course = "JavaScript";

    console.log(name);
    console.log(course);

}

showName();

Example 2: Closure

A closure occurs when an inner function remembers variables from its outer function even after the outer function has finished execution.

function outerFunction() {

    let message = "Welcome to CIIT";

    function innerFunction() {

        console.log(message);

    }

    return innerFunction;
}

let result = outerFunction();

result();

Example 3: Error Handling

JavaScript provides try...catch to handle runtime errors without stopping the complete application.

try {

    let result = 10 / 0;

    console.log(result);

}
catch (error) {

    console.log("An error occurred");

}