CSEN406 Software Engineering Concurrency Table of Contents 01 JavaScript 02 Concurrency 03 Event Loop Introduction Quiz

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Questions and Answers

What does the DOM represent in JavaScript?

A way to handle AJAX requests

A method to freeze the browser temporarily

A representation of the HTML or XML in a tree structure (correct)

A way to access browser cookies

What is the purpose of the Callback Queue in the JavaScript runtime environment?

To handle non-blocking I/O requests

To manage the UI interface for data pickers and sliders

To execute asynchronous tasks after the function or program exits

To store a list of tasks to be processed and their associated callback functions (correct)

What does the term 'asynchronous' mean in the context of JavaScript?

Reloading the page dynamically without user input

Freezing the browser temporarily

Waiting for certain events/operations to complete (correct)

Executing tasks only when the JavaScript execution stack is empty

What does the jQuery library offer for JavaScript developers?

Handling AJAX requests without reloading the page Signup and view all the answers

What happens when a browser is synchronous in JavaScript?

The browser temporarily freezes, disallowing fluid user experience Signup and view all the answers

What is JavaScript mainly used for?

Building dynamic websites Signup and view all the answers

Which of the following are frameworks based on JavaScript?

Angular, React, VueJS Signup and view all the answers

What is the nature of JavaScript in terms of thread handling?

Single-threaded and concurrent Signup and view all the answers

Which type of language is JavaScript?

High-level language Signup and view all the answers

What best describes the capability of JavaScript in terms of execution?

Asynchronous and nonblocking Signup and view all the answers

In the context of JavaScript, what does it mean when it is referred to as 'asynchronous'?

It can execute code in a non-sequential manner Signup and view all the answers

What is the significance of JavaScript being described as a 'high-level language'?

It offers a high level of abstraction from machine operations Signup and view all the answers

What does the term 'concurrency' signify in the context of JavaScript?

The practice of executing multiple tasks simultaneously in a single thread Signup and view all the answers

Why is JavaScript described as a 'nonblocking' programming language?

It doesn't allow input/output operations to block the code execution Signup and view all the answers

What is the implication of JavaScript being 'interpreted' with JIT (Just-in-Time) compilation?

It can convert code into machine language at runtime for performance Signup and view all the answers

In the JavaScript runtime environment, what is the purpose of the Callback Queue?

To store a list of tasks to be processed and their associated callback functions Signup and view all the answers

What is the nature of JavaScript in terms of thread handling?

JavaScript is asynchronous and uses non-blocking IO for better user experience Signup and view all the answers

What does the DOM represent in JavaScript?

A representation of the HTML or XML document in a tree structure Signup and view all the answers

What is the purpose of Web APIs in the JavaScript runtime environment?

To provide browser functionalities like interacting with users, sending network requests, etc. Signup and view all the answers

How does JavaScript handle IO requests to ensure non-blocking behavior?

By allowing the thread to perform other tasks while the request is being processed Signup and view all the answers

Study Notes

JavaScript is a programming language used for building dynamic websites and applications, with many popular frameworks based on it, such as Angular, React, and Node.js.
JavaScript is a high-level, single-threaded, interpreted, asynchronous, and non-blocking language. It has one call stack and FILO (First-In-Last-Out) execution, which can give the impression of being synchronous.
JavaScript runs in the browser, providing interactivity, animation, and real-time content, and can be used for both the frontend and backend.
JavaScript is an example of a high-level language, while machine language and low-level language represent the opposite ends of the abstraction spectrum.
PowerPoint is an example of a single-threaded application, which can only perform one task at a time, but JavaScript's runtime environment allows for asynchronous processing through Web APIs and event loops.
JavaScript's runtime environment includes a callback queue and a task queue. The callback queue stores functions that are called in response to certain events and the task queue stores tasks that are enqueued when a callback function is provided.
JavaScript's non-blocking I/O allows the thread to continue executing while waiting for a response, improving the user experience and preventing the browser from freezing.
Asynchronous JavaScript enables the execution of code without waiting for certain events or operations to complete.
The Document Object Model (DOM) is a tree structure that represents the HTML or XML in a web page and provides methods to select specific HTML elements, change the CSS, and handle AJAX requests, among other things.
jQuery is a JavaScript library that simplifies handling HTML documents and enhances the UI interface. It can be used to create data pickers, sliders, collapsible panels, and dynamically modify the CSS, among other things.

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Description

Test your knowledge on JavaScript, concurrency, and event loop in the context of software engineering. This quiz covers topics such as JavaScript programming language, concurrency, event loop, and its applications in web development, frameworks, and other domains.