Creating a blank dictionary structure

To create a new dictionary structure that contains some or all of the key/value mappings present in an existing dictionary, Tcl provides the dict remove command. The syntax is as follows:

dict remove dictionayValue key1… key2…

How to do it…

In the following example we will create a dictionary containing collections of key/value pairs and then using the dict remove command create a new dictionary containing a portion of the key/value pairs. 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
% set new [dict remove $test 2]
1 John 3 Paul

How it works…

As you can see, the dict remove command has created a new dictionary that contains only the desired key/value pairs. In our example, the key/value pair for key 2 was removed.