80 lines
2.1 KiB
Markdown
80 lines
2.1 KiB
Markdown
# Comment
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A note in code.
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### @parent js/statement
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A comment is a line of code that contains text, usually an explanation or a note. All comments are ignored during script execution.
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### Block
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Right click on any block and add a comment
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### Touch Develop syntax
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To insert a comment in a Touch Develop script:
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1. Click a line in your script.
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2. Click `+`.
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3. Click `// comment` and then type some text (your comment).
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### ~hint
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To find out how to insert comments using the Blocks editor, see [the Blocks editor](/microbit/blocks/editor).
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### ~
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### Sample function with comments
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This function has comments that describe the purpose of the function:
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```
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/**
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* // square function :
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* // returns the square of the input parameter x
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* @param x TODO
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*/
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export function square(x: number) : number {
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let result: number
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return x * x
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return result
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}
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```
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### Formatting
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Use [markdown syntax](/microbit/js/markdown) to format your comments (for example, **bold** and *italic* formatting).
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### Commenting out code
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During the debugging process, you may want to comment out a section of your code so that it doesn't run.
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To comment out a block of code:
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1. Click the first line of code that you want to comment out.
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2. Press and hold the Shift key, and then press the Down arrow key to select a block of code.
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3. In the block editing window, scroll down to **surround with** and click `comment out`. This adds an [if](/microbit/reference/logic/if) statement around your code, like this:
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```
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if (false) {
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// the commented code here...
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}
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```
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When you want to uncomment your code, click the `if false then` statement in your code, and then click `uncomment`.
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### Library and function comments
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* Use [comments](/microbit/js/comment) at the beginning of a library to describe the library
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* Use [comments](/microbit/js/comment) at the beginning of a [function](/microbit/js/function) to describe a function. The comment will appear in the help area of the Touch Develop editor when you insert the function
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### See also
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[markdown syntax](/microbit/js/markdown), [Touch Develop editor](/microbit/js/editor), [Block editor](/microbit/blocks/editor)
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