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Category:Tcl: Difference between revisions
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:''“I got the idea for Tcl while on sabbatical leave at DEC's Western Research Laboratory in the fall of 1987. I started actually implementing it when I got back to Berkeley in the spring of 1988; by summer of that year it was in use in some internal applications of ours, but there was no Tk. The first external releases of Tcl were in 1989, I believe. I started implementing Tk in 1989, and the first release of Tk was in 1991.”''
The principal pre-built distributions of Tcl are all based on [[libtcl]]; the main ones are [http://www.activestate.com/activetcl/ ActiveTcl] from ActiveState, and [[tclkit]] from Equi4 Software ''et al''. Older versions of the language are distributed as part of Apple's OSX and all Linux distributions.
==Grammar==▼
==Language Syntax==
▲===Grammar===
Note that this is a simplified language grammar, and it is normal to think of the language at a higher level where these differences don't show.
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'''|''' “''\\''” escapeSequence charSubsts''?''
'''|''' ordinaryChar charSubsts''?''
==Language
===Value Model===
Tcl's value model operates on two levels.
* Classically, it is defined purely on unmodifiable strings over a language of unencoded [[UNICODE]] characters.
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