String Subcommands - length index range

Tcl commands often have "subcommands". The string command is an example of one of these.

The string command treats its first argument as a subcommand. Utilizing subcommands is a good way to make one command do multiple things without using cryptic names.

For instance, Tcl has string length instead of, say, slength. This lesson covers these string subcommands: string length string Returns the length of string. string index string index Returns the indexth character from string. string range strin...