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NAME

let - from tcl-wiki (Decida Procedure)

USAGE

                let lhsvar assignment arg ...
          
                When assignment equals the '=' string, behaves like
                 'set varname [expr arg ...]'.
                When assignment is the '=' string following an operator 
                  like +, -, *, / or %,  behaves like 'set varname
                  [expr {$varname <operator> args}]'

ARGUMENTS

lhsvar left-hand-side variable
assignment assignment token: one of {= += -= *= /= %=}
args expression

RESULTS

returns result of assignment

EXAMPLE

             % let a = 10
             10
             % let a = $a - 1
             9
             % puts $a
             9
             % let a *= 2
             18

NOTES

arguments do not have to be distinct. You can write this: let a = $a+2 or this: let a = 3 * 4 or even: let a = {$b*cos($d)}
It is best to enclose expressions in braces when they contain variables.

AUTHOR

Sarnold

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