JavaScript Syntax: .Script Elements

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18 Questions

What does a semicolon at the end of a statement in JavaScript signify?

It signifies the end of a command

Where can you optionally place a script in an HTML document if it's not required to execute before the body content is displayed?

At the end of the body element

What is the preferred method for using quotes in JavaScript strings?

Using both single and double quotes interchangeably

How are single line comments denoted in CSS and JavaScript?

//

What is the purpose of multi-line comments in JavaScript?

To provide explanations or notes within the code

Where can JavaScript code be inserted inside an HTML document for better organization?

Inside the element

Where is the recommended placement for most scripts in a webpage?

At the end of the document, just before the closing body tag

What is the primary purpose of applying optimizations during the compilation of a script to machine code?

To analyze data flow and further optimize the machine code

Which attribute is used in the external method of embedding a script to point to a script file URL?

src

Why might placing a script at the bottom of a webpage improve perceived performance?

To allow the page to render before executing scripts

What is a common rule of syntax in JavaScript related to capitalization?

Consistent capitalization of function names and variables is required

What is a benefit of using external style sheets when scripting for different websites?

The application of the same script across various websites

What was JavaScript initially created for?

To make web pages dynamic

Why was JavaScript initially called 'LiveScript'?

In relation to the popular language Java

What is the relationship between JavaScript and Java?

JavaScript and Java have no relation

What makes JavaScript unique compared to other browser technologies?

Full integration with HTML/CSS

Why did JavaScript evolve into a fully independent language?

'LiveScript' had trademark issues

How do JavaScript engines work?

By reading and parsing scripts

Study Notes

  • JavaScript is a programming language initially created to make web pages more interactive and alive.
  • Scripts are written in plain text and can be embedded directly into HTML or linked externally.
  • JavaScript was originally called "LiveScript" but was renamed to leverage the popularity of Java.
  • JavaScript is unique due to its full integration with HTML and CSS, simplicity, and support by all major browsers.
  • The engine reads, compiles, and runs JavaScript code, optimizing it at each step for efficient execution.
  • To embed JavaScript in a webpage, use the script element, and place it at the end of the document for optimal performance.
  • JavaScript function names, variables, and identifiers are case-sensitive.
  • Use semicolons to indicate the end of a command or allow line breaks to do the same.
  • JavaScript supports both double and single quotes in strings.
  • Single-line comments start with two forward slashes, and multi-line comments use the same syntax as in CSS.
  • JavaScript code can be added inside the HTML document's <script> tag to keep it contained and separate from the main content.

Learn about JavaScript syntax, script elements, and the rules of JavaScript programming language. Understand what JavaScript is, how scripts work on web pages, and the difference between JavaScript and Java.

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