To check the valid characters for JavaScript variable names, you should follow the below given naming conventions, which discuss about other rules to name a variable −
- Name can begin with $ and _ characters, for example, _result.
- You should not use any of the JavaScript reserved keywords as a variable name. These keywords are mentioned in the next section. For example, break or boolean variable names are not valid.
- JavaScript variable names should not start with a numeral (0-9). They must begin with a letter or an underscore character. For example, 123test is an invalid variable name but _123test is a valid one.
- JavaScript variable names are case-sensitive. For example, Name and name are two different variables.
Here are the correct forms of a variable name in JavaScrip −
result _result
The following is an incorrect form for a variable name −
2result