JavaScript Overview and Basics
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Questions and Answers

What is the primary purpose of JavaScript?

JavaScript is a scripting language used to create interactive and dynamic web pages.

JavaScript is a compiled language.

False

The syntax of JavaScript was heavily influenced by Java.

True

What is the official name of the standard for JavaScript?

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

What are some of the key features of JavaScript?

<p>Object Orient Script Language</p> Signup and view all the answers

Where is JavaScript typically executed?

<p>Client-side (in the browser)</p> Signup and view all the answers

What is the primary use of Javascript on web pages? Choose the best answer from the options below.

<p>Making web pages interactive, such as using dropdown menus, animations, and form validations.</p> Signup and view all the answers

Which HTML tag is used to embed JavaScript code on a web page?

<p><code>&lt;script&gt;</code></p> Signup and view all the answers

HTML comments can be used to comment JavaScript code.

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

How can we include JavaScript code in an HTML document?

<p>All of the above</p> Signup and view all the answers

What does the document.write( ) method do in JavaScript?

<p>The <code>document.write()</code> method writes text directly into the HTML document.</p> Signup and view all the answers

What are JavaScript variables?

<p>Variables are containers that can store and manipulate data within your JavaScript code.</p> Signup and view all the answers

Variables in JavaScript are 'case sensitive'. What does 'case sensitive' mean?

<p>A variable name with a lowercase letter is different than a variable name with an uppercase letter.</p> Signup and view all the answers

What are the common JavaScript operators?

<p>Common operators in JavaScript include arithmetic operators (like +, -, *, /), assignment operators (like =, +=, -=), comparison operators (like ==, ===, !=, !==, &gt;, &lt;, &gt;=, &lt;=), and logical operators (like &amp;&amp;, ||, !) among others.</p> Signup and view all the answers

What is the difference between the == and === operators in JavaScript?

<p>The <code>==</code> operator checks for equality in value, while the <code>===</code> operator checks for equality in both value and data type.</p> Signup and view all the answers

What does the if statement do in JavaScript?

<p>The <code>if</code> statement allows you to execute a block of code only if a given condition is true. It helps you create conditional logic in your program.</p> Signup and view all the answers

What data types are defined in the latest ECMAScript standard?

<p>Boolean, null, undefined, number, string, object, symbol</p> Signup and view all the answers

What does the switch statement offer in JavaScript?

<p>The <code>switch</code> statement provides a more efficient way to evaluate multiple possible conditions against a single value, effectively acting as a 'multi-way if' statement.</p> Signup and view all the answers

What are the main elements of the JavaScript Statements?

<p>Components of a JavaScript statement include Expressions (represent value), Values (data like numbers, strings), Operators (perform actions on values), Keywords (reserved words with specific meaning, like 'var'), and Comments (non-executable notes within the code).</p> Signup and view all the answers

Study Notes

JavaScript Overview

  • JavaScript is a client-side scripting language
  • It's used to make websites more functional and interactive
  • JavaScript is not the same as Java
  • It's loosely based on Java syntax

JavaScript Objectives

  • Understand the concept of JavaScript
  • Know the JavaScript syntax
  • Use JavaScript in projects

JavaScript Basics

  • Introduction to JavaScript
  • How to enable JavaScript
  • JavaScript syntax
  • JavaScript operators
  • JavaScript variables
  • JavaScript functions
  • JavaScript events
  • JavaScript popup boxes
  • JavaScript and HTML
  • External JavaScript file
  • JavaScript statements
  • JavaScript If Statement
  • JavaScript switch statement
  • JavaScript While loop
  • JavaScript for loop
  • JavaScript try catch
  • JavaScript escape characters
  • JavaScript void(0)

What is JavaScript?

  • JavaScript is a programming language
  • It's an object-based (but not object-oriented) programming language, not object oriented
  • It's weakly typed
  • It's client-side interpreted
  • Designed by Brendan Eich for Netscape
  • Originally called Mocha, then LiveScript, then JavaScript
  • The official standard is ECMAScript

JavaScript Features

  • Object-oriented scripting language
  • Client-edge technology
  • Handling events
  • Statements and looping
  • Lightweight and delicate
  • Case sensitive format
  • Interpreter-centered
  • Validation of user input
  • Else-if statements

What do I need to create JavaScript?

  • A text editor (Notepad, Pico, Simpletext, etc) or an HTML editor
  • A web browser (Chrome, Safari, Edge, Firefox) with JavaScript enabled

JavaScript Syntax

  • JavaScript syntax is a set of rules for writing and interpreting the language
  • It's loosely based on Java syntax.
  • Includes variables, functions, statements, operators, data types, and objects

JavaScript Syntax – Continued

  • The <script> tags define JavaScript code sections
  • The type attribute specifies the language (e.g., text/javascript)
  • HTML comments (<!-- -->) are optional but recommended for JavaScript code enclosed within the script tags
  • Using document.write() displays output on the webpage

Where to put JavaScript?

  • Between HTML head tags
  • Within HTML body tags
  • In an external file

JavaScript Display

  • Writing into an HTML element using innerHTML
  • Writing to the HTML output using document.write()
  • Writing to an alert box using window.alert()
  • Writing to the browser console using console.log()

JavaScript Statements

  • JavaScript statements use expressions, values, operators, keywords, and comments
  • Variables (like x, y, z) store data

JavaScript Arithmetic Operators

  • List of Arithmetic operators, with example outputs and equivalent expressions
  • Include (+, -, *, /, %, ++, --)

JavaScript Assignment Operators

  • List of Assignment operators, with example outputs and equivalent expressions
  • Include (=, +=, -=, *=, /=, %= )

JavaScript Comparison Operators

  • List of Comparison Operators with descriptions (e.g., ==, ===, !=, !==, >, <, >=, <=, ?)

Data Types

  • JavaScript has primitive data types (Boolean, Null, Undefined, Number, String etc.) and objects

Conditional Statements

  • JavaScript uses if…else and switch statements for conditional execution

Example 1: test1js.html

  • A basic example showing how to add JavaScript to an HTML file
  • Provides an alert box upon page load

Example 2: test1js_onload.html

  • Another example, with a similar function trigger when the page loads

Example 3: test1js_tab.html

  • A tab-based example using JavaScript to display tabs

Example...

  • Additional JavaScript examples (e.g., image changing)

JavaScript Add Two Numbers

  • Example using a form and textboxes to add numbers
  • Explanation of the JavaScript code and the result

JavaScript Fahrenheit to Celsius

  • Example converting Fahrenheit to Celsius using input and button

More...

  • Reference to more advanced JavaScript topics in a PDF format

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JavaScript Notes PDF

Description

This quiz covers the fundamental concepts and syntax of JavaScript, a client-side scripting language. It includes topics such as JavaScript variables, functions, and control structures. Test your understanding of JavaScript and its application in web development.

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