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Tcl sandwich - lists in Tcl
In Tcl, a list is simply a string that's held in the same format (i.e. with the same delimiters and protection) as a series of parameters to a Tcl command. The split command (which does a great deal in languages such as Perl and PHP) really does little more than change the delimiters if need be, and add protective \ { and } characters - again only if need be. Here's an example where we're splitting and manipulating the contents of a sandwich. tcl>set sarnie "cheese, marmite, onion, pickle" tcl>set d4 [split $sarnie ,] tcl>set d4 cheese { marmite} { onion} { pickle} At this point, the braces have been added to protect the space character which is part of the individual ingredient tcl>foreach ingrid $d4 { =>puts [string trim $ingrid] =>} cheese marmite onion pickle I used string trim to remove the space before printing each element out Let's rejoin the ingredients into a string using the word "and" as the glue tcl>set d5 [join $d4 " and "] tcl>set d5 cheese and marmite and onion and pickle or as an alternative, print it out sorted into the order of ingedients with my favourite first ;-) tcl>lsort $d4 { marmite} { onion} { pickle} cheese tcl> (written 2004-12-08 01:50:44) Associated topics are indexed under T206 - Tcl/Tk - Lists[2472] split and join in tcl and expect - (2009-10-23) [2468] What are Tcl lists? - (2009-10-22) [1601] Replacing the last comma with an and - (2008-04-04) [1405] Sorting in Tcl - lists and arrays - (2007-10-24) [1402] Tcl - append v lappend v concat - (2007-10-23) [1334] Stable sorting - Tcl, Perl and others - (2007-09-06) [1283] Generating traffic for network testing - (2007-07-29) [1282] Stringing together Tcl scripts - (2007-07-29) [781] Tcl - lappend v concat - (2006-06-27) [463] Splitting the difference - (2005-10-13)
Some other Articles
Programming in isolationRecent technical articles example of Tcl namespaces and packages a comment on comments Tcl sandwich - lists in Tcl Network Camera Colour for access Too technical? Comparison Chart for Perl programmers - list functions Just provide a room and the students |
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