How do you comment out text in JavaScript?
To create a single line comment in JavaScript, you place two slashes “//” in front of the code or text you wish to have the JavaScript interpreter ignore. When you place these two slashes, all text to the right of them will be ignored, until the next line.
What is /* in JavaScript?
Multi-line Comments JavaScript multiline comment has the same purpose as a single-line comment. JavaScript comment block starts with two symbols: /* . To end the comment, use these symbols */ again. Everything between these symbols will be treated as a comment in JavaScript.
How do you show comments in JavaScript?
Multi-line comments start with /* and end with */ . Any text between /* and */ will be ignored by JavaScript.
How does alert work in JavaScript?
The alert() method in JavaScript displays an alert box with a specified message and an OK button. It is often used to make sure that information comes through to the user. The alert box takes the focus away from the current window and forces the browser to read the message.
How do you comment a script tag?
Yes, it is considered as a best practice, since this is to save our code from a browser that does not support JavaScript. The comment ends with a “//–>”. Here “//” signifies a comment in JavaScript, so we add that to prevent a browser from reading the end of the HTML comment as a piece of JavaScript code.
What are the different ways of adding comments in JavaScript?
There are two types of comments in JavaScript.
- Single-line Comment.
- Multi-line Comment.
What does 3 dots in JavaScript mean?
Spread Syntax
(three dots in JavaScript) is called the Spread Syntax or Spread Operator. This allows an iterable such as an array expression or string to be expanded or an object expression to be expanded wherever placed. This is not specific to React. It is a JavaScript operator.
Which symbol is used for comments in JavaScript?
What is the correct syntax for adding comments in JavaScript?
Explanation: Correct Syntax for comments in JavaScript is //comment. 5. How to insert a multi-line comment in JavaScript? Explanation: Correct Syntax for multi-line comments in JavaScript is /*comment*/.
What is the comment tag?
The HTML comment tag is used to add text to an HTML document without including that text in the Web page. This comment will, however, be passed in the HTML file sent to the browser, and can be seen by viewing the page source (View Source). …
Which is the best way to comment in JavaScript?
In this article, we will look at how to comment JavaScript code, as which types of comments exist, and some best practices. Single-line comments are generally used to comment a part of the line or full line of code. Single-line comments in JavaScript start with //.
How does the alert button work in JavaScript?
It displays an alert dialog box that consists of some specified message (which is optional) and an OK button. When the dialog box pops up, we have to click “OK” to proceed. The alert dialog box takes the focus and forces the user to read the specified message.
Why are comments ignored by the JavaScript engine?
Comments are notes written in the code that are ignored by the JavaScript engine, which means they don’t affect the output in any way. Their sole purpose describing how and why code works to other developers, and yourself. In this article, we will look at how to comment JavaScript code, as which types of comments exist, and some best practices.
When to use JavaScript comments to prevent execution?
JavaScript comments can also be used to prevent execution, when testing alternative code. Single line comments start with //. Any text between // and the end of the line will be ignored by JavaScript (will not be executed).