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Tcl - nice and nasty
Tcl is a lovely engineers language ... but goodness you can do some nasty things with it, and write some unmaintainable code.
set count 1
foreach type {if while} {
$type {$count < 5} {
puts "yay $type $count"
incr count
}
}
Which runs as follows:
earth-wind-and-fire:~ grahamellis$ tclsh tty
yay if 1
yay while 2
yay while 3
yay while 4
earth-wind-and-fire:~
A sign of a pure interpretative language ... the code changing from an if to a while as it runs. Is this:
a) An example of how you should NOT write code
b) An example of polymorphism when you least expect it
c) A feature looking for a benefit
d) All three of the above
And the answer is, of course, (d) (written 2009-06-29, updated 2009-06-30)
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles T203 - Tcl/Tk - Conditionals and Loops [4455] Working out distance between places, using OS grid references and a program in Tcl - (2015-03-11) [4323] Learning to program - Loop statements such as while - (2014-11-22) [4322] Learning to Program - the conditional statement (if) - (2014-11-21) [3571] Comparing loop commands in Tcl - (2012-01-06) [3570] Trapping errors in Tcl - the safety net that catch provides - (2012-01-06) [3397] Does a for loop evaluate its end condition once, or on every iteration? - (2011-08-18) [3189] Tcl - the danger of square brackets in a while command - (2011-03-02) [2681] Tcl - a great engineering language - (2010-03-17) [2471] A short form of if ... then ... else - (2009-10-23) [1696] Saying NOT in Perl, PHP, Python, Lua ... - (2008-07-04) [1477] Decisions - small ones, or big ones? - (2007-12-18) [1401] Tcl - using [] or {} for conditions in an if (and while) - (2007-10-23) [210] Joining lists in Tcl. Indirect variables in Tcl. - (2005-02-12)
Some other Articles
A chance to do the tourist thingLearning about others private livesMysqldump fails as a cron job - a work aroundHistory is not always prettyTcl - nice and nastyImportant - the future of Melksham / Chamber of CommerceGrouping rows for a summary report - MySQL and PHPQuestions I have been asked on answering the phoneRamblings on church and state linkage in MelkshamIs it Python past cheetah already?
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