Each parameter has a variable name and an associated value.

The first 31 characters of a variable name are significant.

More formally an environment is a set of pairs were is a variable name and its type.

They are usually referenced by putting special symbols in front of or around the variable name.

This function determines whether the variable name passed as its argument is an array.

Each variable name must be the name of a character from a Shakespeare play.

Play well with other scripts by avoiding global function and variable names.

Yep, it's an int again, but you know so much more about it just by looking at the variable name.

A computer doesn't care if your variable names are meaningful.

The first character of the variable name must be a letter.