Tcl/Tk 8.5 Programming Cookbook

Updating variables from a dictionary

To update the values stored within a dictionary Tcl provides the dict set command. The syntax of this command is as follows:

	dict set name key value… key value…

How to do it…

In the following example, we will create a dictionary containing collections of key/value pairs and then using the dict set we will update a stored value. Return values from the commands are provided for clarity. Enter the following command:

% set test [dict create 1 John 2 Mary 3 Paul]
1 John 2 Mary 3 Paul

% dict set test 2 Martha
1 John 2 Martha 3 Paul

How it works…

The dict set command updates the value stored for the key in the dictionary referenced to by the name argument.