JavaScript Introduction and Basics
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Questions and Answers

What is the primary purpose of JavaScript?

  • To create graphical user interfaces.
  • To manage databases.
  • To give instructions to the computer. (correct)
  • To design web pages.

    • Which tool is used for writing JavaScript code during the initial setup?

  • Notepad
  • Adobe Dreamweaver
  • VS Code (correct)
  • Microsoft Word

    • Which statement is correct regarding the use of 'console.log'?

  • console.log is used to store variables.
  • console.log can be used to perform calculations.
  • console.log is used to log messages to the console. (correct)
  • console.log does not print messages to the console.

    • Which of the following is NOT a rule for naming variables in JavaScript?

    <p>Variable names can contain spaces.</p> Signup and view all the answers

    What does the 'var' keyword signify in JavaScript?

    <p>The variable can be both re-declared and updated.</p> Signup and view all the answers

    What type of variable is defined with the 'const' keyword?

    <p>A variable that cannot be updated or re-declared.</p> Signup and view all the answers

    Which of the following symbols is NOT allowed as a first character in a variable name?

    <p>1</p> Signup and view all the answers

    Which JavaScript environment can be used temporarily for writing code before moving it to a file?

    <p>Browser Developer Tools console</p> Signup and view all the answers

    Study Notes

    JavaScript Introduction

    • JavaScript (JS) is a programming language used to give instructions to a computer.
    • Input (code) is processed by the computer, and output is generated.

    Setting up VS Code

    • VS Code is a free and popular code editor created by Microsoft.

    First JavaScript Code

    • console.log() is used to display messages in the console/terminal.
    • console.log("Apna College"); is an example of printing "Apna College" in the console.

    Variables in JavaScript

    • Variables are containers for storing data.
    • Example: radius storing the value 14.

    Variable Rules

    • Variable names are case-sensitive.
    • Valid characters include letters, digits, underscore (_), and the dollar sign ($).
    • Spaces are not allowed.
    • The first character must be a letter, underscore, or dollar sign.
    • Reserved words cannot be used as variable names.

    let, const, and var

    • var: Can be redeclared and updated, global scope.
    • let: Cannot be redeclared but can be updated, block scope.
    • const: Cannot be redeclared or updated, block scope.

    Data Types in JavaScript

    • Primitive data types include: Number, String, Boolean, Undefined, Null, BigInt, Symbol.

    Additional Information (from images)

    • Shradha Khapra is a co-founder of Apna College, an ex-Microsoft employee and TedX speaker.
    • A practice question asks to create a constant object called "product" containing information about a pen.
    • Another practice question asks to create a constant object "profile" containing information about a person.

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    Related Documents

    JS1 ClassNotes PDF

    Description

    This quiz covers the fundamental concepts of JavaScript, including its setup, basic syntax, and variable rules. You will learn how to write your first piece of JavaScript code using console.log() and explore the different types of variable declarations with let, const, and var.

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