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list manipulation with struct::list
Lists example from a Well House Consultants training course
More on Lists [link]
Source code: slist Module: T206
# list manipulation with struct::list
package require struct::list # Reverse set outbound {Swindon Chippenham Melksham Trowbridge Westbury} set inbound [struct::list reverse $outbound] puts $outbound puts $inbound # Swindon Chippenham Melksham Trowbridge Westbury # Westbury Trowbridge Melksham Chippenham Swindon # ----------------------------------------------- # Map (modify) proc aok where { append where " on time" return $where } set running [struct::list map $outbound aok] puts $running # {Swindon on time} {Chippenham on time} {Melksham on time} {Trowbridge on time} {Westbury on time} # ----------------------------------------------- # Map via loop struct::list mapfor place $inbound { puts -nonewline "[string toupper $place ], " } puts "" # WESTBURY, TROWBRIDGE, MELKSHAM, CHIPPENHAM, SWINDON, # ----------------------------------------------- # Filter proc pork raw {string match *ham $raw} set ham [struct::list filter $outbound pork] puts $ham # Chippenham Melksham # ----------------------------------------------- # Repeat set rota [struct::list repeat 5 $outbound $inbound] puts $rota # {Swindon Chippenham Melksham Trowbridge Westbury} {Westbury Trowbridge # Melksham Chippenham Swindon} {Swindon Chippenham Melksham Trowbridge Westbury} # {Westbury Trowbridge Melksham Chippenham Swindon} {Swindon Chippenham # Melksham Trowbridge Westbury} {Westbury Trowbridge Melksham Chippenham Swindon} # {Swindon Chippenham Melksham Trowbridge Westbury} {Westbury Trowbridge # Melksham Chippenham Swindon} {Swindon Chippenham Melksham Trowbridge Westbury} # {Westbury Trowbridge Melksham Chippenham Swindon} set asone [struct::list flatten $rota] puts $asone # Swindon Chippenham Melksham Trowbridge Westbury Westbury Trowbridge Melksham # Chippenham Swindon Swindon Chippenham Melksham Trowbridge Westbury Westbury # Trowbridge Melksham Chippenham Swindon Swindon Chippenham Melksham Trowbridge # Westbury Westbury Trowbridge Melksham Chippenham Swindon Swindon Chippenham # Melksham Trowbridge Westbury Westbury Trowbridge Melksham Chippenham Swindon # Swindon Chippenham Melksham Trowbridge Westbury Westbury Trowbridge Melksham # Chippenham Swindon # ----------------------------------------------- # Repeat (note expanding lists ahead of passing to repeat) set rota [struct::list repeat 5 {*}$outbound {*}$inbound] puts $rota # Swindon Chippenham Melksham Trowbridge Westbury Westbury Trowbridge Melksham # Chippenham Swindon Swindon Chippenham Melksham Trowbridge Westbury Westbury # Trowbridge Melksham Chippenham Swindon Swindon Chippenham Melksham Trowbridge # Westbury Westbury Trowbridge Melksham Chippenham Swindon Swindon Chippenham # Melksham Trowbridge Westbury Westbury Trowbridge Melksham Chippenham Swindon # Swindon Chippenham Melksham Trowbridge Westbury Westbury Trowbridge Melksham # Chippenham Swindon # ----------------------------------------------- # Shift and Swap set starts [struct::list shift outbound] puts "Runs from $starts to $outbound" struct::list swap outbound 0 3 struct::list swap outbound 1 2 puts "Runs back from $outbound to $starts" # Runs from Swindon to Chippenham Melksham Trowbridge Westbury # Runs back from Westbury Trowbridge Melksham Chippenham to Swindon 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 Books covering this topic
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Other Examples
This example comes from our "Lists" training module. You'll find a description of the topic and some
other closely related examples on the "Lists" module index page.
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