Tcl/Tk 8.5 Programming Cookbook

Getting a list element

As we can now determine the number of elements contained within a list, it is time to retrieve one or more of those elements. To accomplish this, Tcl provides the lrange command. The syntax is as follows:

	lrange list first last

How to do it…

In the following example, we will pass a list to the lrange command to retrieve the elements contained with the indices provided. Return values from the commands are provided for clarity. Enter the following command:

% lrange {John Mary Bill Fred Tom Sally} 0 1
John Mary

How it works…

The lrange command accepts a valid Tcl list and returns a new list consisting of the elements referenced in the index values provided in first and last last inclusive. If the index contained in first is ...