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dicts - using the various subcommands
Arrays and dicts example from a Well House Consultants training course
More on Arrays and dicts [link]

This example is described in the following article(s):
   • Tcl - dicts - a tutorial and examples - [link]

Source code: dicdem Module: T208

proc timetable {type schedule} {
        puts "\n----------> $type"
        dict for {where when} $schedule {
                puts [format "%-25s %11s" $where $when]
                }
        }

set mydata [dict create "Cardiff Central" 06:28 Newport 06:42 \
                "Severn Tunnel Junction" 06:53 Pilning 07:03 Patchway 07:06]
dict lappend mydata {Filton Abbey Wood} 07:09
set moredata [dict create "Bristol Temple Meads" dunno Bath\ Spa 07:35 \
                Bradford-on-Avon 07:47 Trowbridge 07:53 Westbury 08:00]

# Merge two dictionaries
set allway [dict merge $mydata $moredata]

timetable original $allway

# lappend only adds ONE item - so this has to be 2 separate commands
dict lappend allway Warminster 08:09
dict lappend allway Salisbury 08:32

# Add to existing value within the dictionary
dict append allway Westbury -08:01

# Remove an item from the dictionary
set allway [dict remove $allway Pilning]

# Replace a value
set allway [dict replace $allway {Bristol Temple Meads} 07:22]

timetable modified $allway

# search by value and return a shorter dict
set before_8 [dict filter $allway value {0[0-7]*} ]

timetable "before 8 a.m." $before_8

# How many items?
set sz [dict size $before_8]
puts "There are $sz items in that dict"

Learn about this subject
This module and example are covered on the following public courses:
 * Learning to program in Tcl
 * Tcl Programming
 * Tcl Programming
Also available on on site courses for larger groups

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Other Examples
This example comes from our "Arrays and dicts" training module. You'll find a description of the topic and some other closely related examples on the "Arrays and dicts" module index page.

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