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Sorting a dict
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):
   • Sorting dicts and arrays in Tcl - [link]

Source code: rail_dict Module: T208
# Sorting a dict

set fh [open railstats.xyz r]

# Create the dictionary

while {[gets $fh here] >= 0} {
        set columns [split $here \t]
        set name [lindex $columns 6]
        set peeps [lindex $columns 7]
        if {$peeps > 800 && $peeps < 1200} {
                dict set counter $name $peeps

proc val_num {a b} {
        global counter
        return [expr [dict get $counter $a] - [dict get $counter $b]]

# Get a list of the keys and sort them

set stns [dict keys $counter]
set sio [lsort -command val_num $stns]

# Output them by looking up keys from the list

foreach place $sio {
        set peeps [dict get $counter $place]
        puts [format "%-25s %5d" $place $peeps]

# You can also rebuild your dict in the new order

foreach place $sio {
        set peeps [dict get $counter $place]
        puts $peeps
        dict set ordered $place $peeps

# (I have tested that but not added any puts to show you)



Sample Output

munchkin:ftcl grahamellis$ tclsh rail_dict
Berney Arms 806
Pen-Y-Bont 829
Llanbister Road 852
Wressle 870
Llangynllo 872
Hopton Heath 904
Acklington 917
Quintrel Downs 918
St.Budeaux Ferry Road 969
Dolgarrog 992
Cilmeri 1023
Stromeferry 1035
Abererch 1038
Tal-y-Cafn 1039
St.Keyne 1053
Finstock 1055
Thurgarton 1056
South Bank 1057
Bynea 1064
Springfield 1076
Dovey Junction 1093
Burnley Barracks 1103
Georgemas Junction 1108
Roche 1137
Llandecwyn 1148
munchkin:ftcl grahamellis$

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.

Full description of the source code
You can learn more about this example on the training courses listed on this page, on which you'll be given a full set of training notes.

Many other training modules are available for download (for limited use) from our download centre under an Open Training Notes License.

Other resources
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This is a sample program, class demonstration or answer from a training course. It's main purpose is to provide an after-course service to customers who have attended our public private or on site courses, but the examples are made generally available under conditions described below.

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