Published source code accompanying the article by John Ousterhout in which he describes the design decisions he made to ensure that the Tcl scripting language would be highly extensible.
Extensibility in Tcl
by John Ousterhout
Listing One
set a 43
set b $a
set c [expr $a+10]
puts "The value of c is $c"
puts {Lunch costs $6.95}
Listing Two
foreach i {2 4 6 8 10} {
puts "$i squared is [expr $i*$...
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