Naming variables in JavaScript

David Y.

The problem

How should I name the variables in my JavaScript code?

The solution

  • Variable names must start with a letter, an underscore (_) or a dollar sign ($).
  • Variable names cannot contain spaces.
  • Variables cannot be the same as reserved keywords such as if or const.
  • By convention, JavaScript variable names are written in camelCase.
  • Variables should be given descriptive names that indicate their content and usage (e.g. sellingPrice and costPrice rather than x and y).
  • As JavaScript variables do not have set types, it can be useful to include an indication of the type in the name (e.g. orderNumber is obviously a numeric ID, whereas order could be an object, a string or anything else).
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