JavaScript Practice Test

Question 1

Which standard construct for data validation is available in the development environment?

Accepted Answer

All of the above

Answer

Data validation in a development environment involves various techniques. This can include using specific validation constructs (like HTML5 input types and attributes, or JavaScript validation libraries), super controlled loop constructs for iterating and checking data, and ensuring case sensitivity checks where appropriate for data integrity. All these methods contribute to robust data validation.

Question 2

In NetScape, the main purpose of a "Live Wire" is to

Accepted Answer

permit server side, Javascript code, to connect to RDBMS

Answer

Netscape LiveWire was an early server-side JavaScript platform. Its primary purpose was to enable JavaScript code running on the server to interact with relational database management systems (RDBMS). This allowed developers to build dynamic web applications by connecting server-side JavaScript logic to databases for data storage and retrieval.

Question 3

When the page has finished parsing, which attribute is utilized to specify that the script be executed?
 (only for external scripts)

Accepted Answer

defer

Answer

The `defer` attribute on a `<script>` tag (for external scripts) tells the browser to download the script in parallel with parsing the HTML document, but to execute it only after the HTML document has been fully parsed. This ensures that the script doesn't block the rendering of the page and that the DOM is ready when the script runs.

Question 4

The script tag must be included in

Accepted Answer

head and body

Answer

The `<script>` tag can be placed in either the `<head>` section or the `<body>` section of an HTML document. Placing it in the `<head>` allows scripts to be loaded before the page content, while placing it at the end of the `<body>` is a common practice to ensure the HTML content is parsed and rendered before the script executes, preventing rendering blocks.

Question 5

To add external JS code in your HTML document, which of the following attributes is used?

Accepted Answer

src

Answer

To link an external JavaScript file to an HTML document, the `` tells the browser to load and execute the JavaScript code from `my-script.js`.