JavaScript and Code Editors Quiz

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Questions and Answers

What type of values can be stored in an array?

A mix of integers, floats, strings, and booleans (correct)
Only boolean values
Only string values
Only integer values

How are array elements accessed in JavaScript?

Using floating-point numbers
Using associative pairs
By their integer index positions (correct)
Using string keys

Which operator is used for addition and assignment in JavaScript?

assign +
+= (correct)
add &=
++

Which of the following correctly describes pre-increment and post-increment operators?

Pre-increment adds before the value is used, post-increment adds after (A) Signup and view all the answers

Which comparison operator checks for inequality in JavaScript?

!= (B) Signup and view all the answers

What character can a variable name not start with?

A number (B) Signup and view all the answers

Which of the following is true about constants in JavaScript?

Their values cannot be changed. (C) Signup and view all the answers

What is the purpose of the console.log() method in JavaScript?

It logs messages to the browser's debugging console. (D) Signup and view all the answers

What keyword is used to declare a block-scoped variable in JavaScript?

let (B) Signup and view all the answers

Which of the following correctly initializes a variable in JavaScript?

const myVariable = 'Hello'; (B) Signup and view all the answers

How would you execute a JavaScript file named 'script.js' using Node.js from the terminal?

node script.js (C) Signup and view all the answers

What is a key distinction between var and let in variable declarations?

var is global-scoped, while let is not. (C) Signup and view all the answers

What symbol is used to terminate JavaScript statements?

; (B) Signup and view all the answers

What is the primary purpose of Node.js?

To execute JavaScript code outside the web browser. (B) Signup and view all the answers

Which of the following is a recommended extension for Visual Studio Code?

Live Server (B) Signup and view all the answers

What is necessary in JavaScript to use console.log() correctly?

It must always be written in lowercase. (C) Signup and view all the answers

Where can user and workspace settings be changed in Visual Studio Code?

From the File – Preferences – Settings menu. (B) Signup and view all the answers

Which of the following describes the syntax for including JavaScript in an HTML document?

Which platform is mentioned as an alternative to Apache for creating web servers?

Node.js (D) Signup and view all the answers

What type of programming syntax is emphasized by JavaScript?

Lexical grammar and case sensitivity. (D) Signup and view all the answers

Where can additional extensions for Visual Studio Code be found?

On the Visual Studio marketplace. (C) Signup and view all the answers

Which programming environments are recommended for JavaScript development?

Sublime Text and Notepad++ (B) Signup and view all the answers

What feature does Node.js provide for JavaScript development?

Integrated development environment functionalities (D) Signup and view all the answers

What is a common tool mentioned for enhancing coding speed in HTML and CSS?

Emmet (C) Signup and view all the answers

What is one of the primary uses of the Node Package Manager (NPM)?

Managing packages for JavaScript (D) Signup and view all the answers

Which of the following is NOT a focus of the basic approach in JavaScript programming?

Network programming (A) Signup and view all the answers

Which statement about variables and constants in JavaScript is true?

Variables can be reassigned new values. (C) Signup and view all the answers

What are arrow functions primarily used for in JavaScript?

To create anonymous functions with a different syntax (D) Signup and view all the answers

What is JSON primarily used for in JavaScript?

Storing and exchanging data (C) Signup and view all the answers

Study Notes

Working Environment

Multiple code editors exist: Sublime Text, Notepad++, Atom, Bracket, etc.
Many extensions are available to enhance code editor functionality.
Node.js provides a Javascript engine for running JavaScript code in environments like Visual Studio Code.
Node.js also enables building network applications using its built-in webserver.
Visual Studio Code is an IDE (Integrated Development Environment) that offers advanced features for code editing, debugging, and project management.
VSCode provides user and workspace settings to customize the environment.
VSCode has a marketplace for extensions, including Code Runner, Live Server, Prettier, Wrap Console Log, Live Share, and more.

Lexical Grammar

Javascript is a case-sensitive language.
Statements are terminated with a semicolon.
Comments are indicated by "//" for single-line comments, or by enclosing text within "/" and "/" for multi-line comments.
JavaScript code is executed in a browser, displaying results in the browser console using console.log().

Declarations & Types

Variables are used to store data and are declared using the keywords "var", "let", or "const".
Variable names must follow these rules:
- Start with a letter, underscore (_), or dollar sign ($).
- Subsequent characters can be letters, numbers, underscores, or dollar signs.
- Case sensitivity applies.
- Avoid accents (à, ü, etc.), even if permitted by the engine.
Constants, declared using "const", cannot be reassigned after their initial declaration.
Arrays are used to store lists of data.
Each element in an array has an index (an integer key), starting from 0.
Arrays can be declared using the array constructor (new Array()) or using array literals.
Accessing array elements is done using their index positions.

Expressions and Operators

Assignment operators: "=".
Arithmetic operators: "+", "-", "*", "/", "%".
Arithmetic and assignment operators: "+=", "-=", "*=", "/=" etc.
Incrementing and decrementing operators: "++i" (pre-increment), "i++" (post-increment), "--i", "i--".
String or concatenation operator: "+", "+=".
Comparison operators: "==", "!=", ">", ">=", "<", "<=".

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Description

Test your knowledge on JavaScript programming and various code editors like Visual Studio Code, Sublime Text, and more. This quiz covers essential features, extensions, and the lexical aspects of JavaScript syntax to enhance your coding skills.