Tcl/Tk - Arrays

Arrays - Tcl/Tk module T208

Arrays are variables that can contain a number of strings, and each one can be looked up by its index and key. Unlike arrays in other languages, array keys in Tcl are strings, not integers, and array members can contain strings of differing lengths. You'll start this module learning about the basics of arrays, and go on to learn some of the wider uses and extra power that's provided by their somewhat unusual specification, taught by example.

This topic is presented on public course Tcl Basics

Examples from our training material

ar1	First use of arrays
ar2	Checking if an array key exists
ar3	looping though an array with array get
arr_log	Access log counter using arrays
arr_log_2	Selecting elements from an array - glob matching to keys
arr_log_3	Passing arrays in and out of procs - using upvar
ifinder	search for icon references; list icon names
ifinder2	search for icon references and count them
stfinal	final exercise - array of dialling codes
topskill	setting up an array of lists, sorting, listing out elements

Opentalk forum discussions related to this topic

Array names variable substitution
how to store data in array
Tcl Arrays

Pictures

Arrays in Tcl
A small group learns Tcl on a private course

Background information

Some modules are available for download as a sample of our material or under an Open Training Notes License for free download from http://www.training-notes.co.uk.

Topics covered in this module

First use of an array.
Setting up an array.
Referencing elements of an array.
Enquiring on an array.
Arrays rather than lists.
A wider range of array commands.
Array get and set.
Selecting elements from an array.
Uses of arrays.
Using numeric indexes.
Passing arrays to procs.
Unique keys.

Complete learning

If you are looking for a complete course and not just a information on a single subject, visit our Listing and schedule page.

Well House Consultants specialise in training courses in Tcl/Tk, Expect,Python, Perl, PHP, and MySQL. We run Private Courses throughout the UK (and beyond for longer courses), and Public Courses at our training centre in Melksham, Wiltshire, England. It's surprisingly cost effective to come on our public courses - even if you live in a different country or continent to us.

We have a technical library of over 600 books on the subjects on which we teach. These books are available for reference at our training centre. Also available is the Opentalk Forum for discussion of technical questions.