Quizz for Javascript and typescript

What is a closure in JavaScript?

• A way to lock variables in a function

• A combination of a function and the lexical environment within which that function was declared

• A method for closing browser windows

Which of the following best describes a Promise in JavaScript?

• A mechanism for asynchronous programming

• A callback function

• A data type in JavaScript

What is event delegation in JavaScript?

• The process of handling events in a nested manner

• The assignment of a single event listener to a common ancestor of multiple elements

• The use of event bubbling

In JavaScript, what is the purpose of prototypes?

• To create private variables

• To implement inheritance

• To store metadata about functions

How does Async/Await differ from using Promises in JavaScript?

• Async/Await is just syntax sugar for Promises

• Async/Await allows for more readable asynchronous code

• Promises are faster than Async/Await

Which of the following is an ES6 feature?

• var keyword

• Arrow functions

• document.write() method

What is hoisting in JavaScript?

• A technique for organizing code in sections

• The process of moving variable and function declarations to the top of their containing scope

• A type of sorting algorithm

What is the difference between global scope and local scope in JavaScript?

• Global scope refers to variables outside functions, while local scope refers to variables inside functions

• Global scope is used for constants, while local scope is used for variables

• There is no difference; the terms are interchangeable

What defines a pure function in functional programming?

• A function that doesn't modify external state and produces the same output for the same input

• A function that performs side effects

• A function with no return statement

How does event delegation simplify DOM manipulation?

• By eliminating the need for event listeners

• By allowing a single event listener on a common ancestor to handle events for multiple elements

• By automatically propagating events to child elements