A parameter or variable name preceded by a dollar sign, and possibly enclosed in braces, will be replaced with the value of that parameter or variable..
Variable names must begin with an alphabetic character, must be unique within the same scope, can't be longer than 255 characters, and can't contain an embedded period or type-declaration character.
Local scope is a characteristic of variables that makes them local(i.e., the variable name is only bound to its value within a scope which is not the global scope).
One way to ensure you have every possibility covered is to have a catch-all pattern for the last arm---for example, a variable name matching any value can never fail and thus covers every case remaining.
One way to ensure you have covered every possibility is to have a catchall pattern for the last arm: for example, a variable name matching any value can never fail and thus covers every remaining case.
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