14.4. Variables

No particular character identifies a variable in JavaScript as the dollar sign does in PHP. Instead, variables use the following naming rules:

• A variable may include only the letters a-z, A-Z, 0-9, the $ symbol, and the underscore (_).

• No other characters such as spaces or punctuation are allowed in a variable name.

• The first character of a variable name can be only a-z, A-Z, $, or _ (no numbers).

• Names are case-sensitive. Count, count, and COUNT are all different variables.

• There is no set limit on variable name lengths.