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Questions and Answers
What does the DOM represent in JavaScript?
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?
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?
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?
What does the jQuery library offer for JavaScript developers?
What happens when a browser is synchronous in JavaScript?
What happens when a browser is synchronous in JavaScript?
What is JavaScript mainly used for?
What is JavaScript mainly used for?
Which of the following are frameworks based on JavaScript?
Which of the following are frameworks based on JavaScript?
What is the nature of JavaScript in terms of thread handling?
What is the nature of JavaScript in terms of thread handling?
Which type of language is JavaScript?
Which type of language is JavaScript?
What best describes the capability of JavaScript in terms of execution?
What best describes the capability of JavaScript in terms of execution?
In the context of JavaScript, what does it mean when it is referred to as 'asynchronous'?
In the context of JavaScript, what does it mean when it is referred to as 'asynchronous'?
What is the significance of JavaScript being described as a 'high-level language'?
What is the significance of JavaScript being described as a 'high-level language'?
What does the term 'concurrency' signify in the context of JavaScript?
What does the term 'concurrency' signify in the context of JavaScript?
Why is JavaScript described as a 'nonblocking' programming language?
Why is JavaScript described as a 'nonblocking' programming language?
What is the implication of JavaScript being 'interpreted' with JIT (Just-in-Time) compilation?
What is the implication of JavaScript being 'interpreted' with JIT (Just-in-Time) compilation?
In the JavaScript runtime environment, what is the purpose of the Callback Queue?
In the JavaScript runtime environment, what is the purpose of the Callback Queue?
What is the nature of JavaScript in terms of thread handling?
What is the nature of JavaScript in terms of thread handling?
What does the DOM represent in JavaScript?
What does the DOM represent in JavaScript?
What is the purpose of Web APIs in the JavaScript runtime environment?
What is the purpose of Web APIs in the JavaScript runtime environment?
How does JavaScript handle IO requests to ensure non-blocking behavior?
How does JavaScript handle IO requests to ensure non-blocking behavior?
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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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