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).