Which symbol is used for comments in Javascript? Explanation: Single line comments start with //.

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

symbol /*

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 // . The interpreter will ignore everything to the right of this control sequence until the end of the line.

How to comment 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”.

yaml files), you can comment-out multiple lines by:

1. selecting lines to be commented, and then.
2. Ctrl + Shift + C.

For single line comment you can use Ctrl + / and for multiple line comment you can use Ctrl + Shift + / after selecting the lines you want to comment in java editor. On Mac/OS X you can use ⌘ + / to comment out single lines or selected blocks.

All you have to do is to select all lines of code you want to comment or uncomment. To make this option visible go to View – Toolbars – and tick the Edit option. A new set of options will appear in the toolbar. Among them you will find the Comment/Uncomment buttons, as you can see in the image.

If you select a block of code and use the key sequence Ctrl+K+C, you’ll comment out the section of code. Ctrl+K+U will uncomment the code.

Commenting Multiple Lines There are two ways to add multiple single-line comments in R Studio: First way: Select the multiple lines which you want to comment using the cursor and then use the key combination “control + shift + C” to comment or uncomment the selected lines.

Multiline Comment Workarounds?

1. You can write your multiline comments without # . Then select all these lines and use Ctrl + Shift + C to comment all these lines simultaneously.
2. In editor, you can start the first line of your multiline comment by #’ .

1. Select the block of code that you want to comment.
2. Press Ctrl + Shift + C.

If you use RStudio, you can use the keyboard shortcut Ctrl + Shift + C ( Command + Shift + C on macOS) to comment out a line of text.

Adding HTML Comments in Markdown Unlike a “normal” HTML comment which opens with comment in Markdown opens with Markdown parsers support two-dash HTML comments, but the three-dash version is more universally compatible.

Select the block of code you want to run, and then press Ctrl+R (in RGui) or Ctrl+Enter (in RStudio). Send the entire script to the console (which is called sourcing a script). In RGui, click anywhere in your script window, and then choose Edit→Run all.

How to add multi-line or block comments in R? There is also a short cut for this; so, after selecting your code you can just click Ctrl + shift + C and voilà. Your code is commented.

Learning ggplot2 R for Data Science is designed to give you a comprehensive introduction to the tidyverse, and these two chapters will get you up to speed with the essentials of ggplot2 as quickly as possible. If you’d like to follow a webinar, try Plotting Anything with ggplot2 by Thomas Lin Pedersen.

Usage. library(tidyverse) will load the core tidyverse packages: ggplot2, for data visualisation. dplyr, for data manipulation.