> For the complete documentation index, see [llms.txt](https://kdoore.gitbook.io/cs1334/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://kdoore.gitbook.io/cs1334/javascript_syntax/indentifiers.md).

# Indentifiers

An identifier is a user defined name that can be used for user-created variables or functions, there are specific syntax rules for identifier names:

* identifiers can only contain: letters, numbers, the underscore character `_` or the dollar `$` character.
* identifiers must start with a letter, an underscore, or dollar-sign (not with a number)
* identifiers cannot contain white-space or blank spaces
* javascript is case-sensitive: `myValue` and `Myvalue` are not equivalent