Evaluate numbers from the argument and return a particular value.
Compare numbers, or strings, or both and return a value.
Convert one type of data representation to another type of data representation.
Manipulate the characters and spacing in strings supplied in the argument.
Analyze a string supplied in the argument (or a variable representing a string) and return a particular value.
Do not clearly fit into any of the other categories.
The following tables briefly describe the functions in each category. For a complete description of these functions, see Functions.