How do you insert a comment in a JavaScript file?

How do you insert a comment in a JavaScript file?

For a single-line comment, you have to write two forward slashes: // . Anything that goes after // up until a line break is treated as a JavaScript comment and not executed as code.

What are the two types of comments in JavaScript?

There are two types of comments in JavaScript.

  • Single-line Comment.
  • Multi-line Comment.

Which is not correct way to write comment in JavaScript?

Multi-line comments start with /* and end with */ . Any text between /* and */ will be ignored by JavaScript.

How do I comment in JSON?

JSON does not support comments. It was also never intended to be used for configuration files where comments would be needed. Hjson is a configuration file format for humans.

What are the best practices for commenting your code?

Primarily, a single “block” comment should be placed at the top of the function (or file) and describe the purpose the code and any algorithms used to accomplish the goal. In-line comments should be used sparingly, only where the code is not “self-documenting”.

How do you write an expression in JavaScript?

JavaScript has the following expression categories:

  1. Arithmetic: evaluates to a number, for example 3.14159.
  2. String: evaluates to a character string, for example, “Fred” or “234”.
  3. Logical: evaluates to true or false.
  4. Primary expressions: Basic keywords and general expressions in JavaScript.

What does != Mean in JavaScript?

!= means not equal to. Your code is checking if value is available – Rajesh Oct 20 ’16 at 14:30.

What does => mean in jQuery?

In jQuery, the $ sign is just an alias to jQuery() , then an alias to a function. This page reports: Basic syntax is: $(selector).action() A dollar sign to define jQuery. A (selector) to “query (or find)” HTML elements.

Why is JavaScript used?

JavaScript is commonly used for creating web pages. It allows us to add dynamic behavior to the webpage and add special effects to the webpage. On websites, it is mainly used for validation purposes. JavaScript helps us to execute complex actions and also enables the interaction of websites with visitors.

What is $() in jQuery?

$ is pretty commonly used as a selector function in JS. In jQuery the $ function does much more than select things though. You can pass it a selector to get a collection of matching elements from the DOM. You can pass it a function to run when the document is ready (similar to body.

Is jQuery an API?

jQuery is a fast, small, and feature-rich JavaScript library. It makes things like HTML document traversal and manipulation, event handling, animation, and Ajax much simpler with an easy-to-use API that works across a multitude of browsers.

Which jQuery statement is true?

Explanation: The jQuery hasClass() method is used to check whether selected elements have a specified class name or not. It returns TRUE if the specified class is present in any of the selected elements; otherwise, it returns FALSE.

Which jQuery method is used to hide selected?


Which is the shortcut to sign in jQuery?

Prototype, jQuery, and most javascript libraries use the $ as the primary base object (or function). Most of them also have a way to relinquish the $ so that it can be used with another library that uses it. In that case you use “jQuery” instead of “$”. In fact, “$” is just a shortcut for “jQuery”.

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