Polymorphism - Making TCL operators work for you

Is there a functional difference between comparison operators such as "ne, eq, != and =="? What really is the difference between "ne" and "!="? What about "eq" and "=="? When should you use one versu...

Published Apr 15, 2008

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Andy_Herrman_22

Nimbostratus

Apr 16, 2008

Here's another simple example that shows the difference between == and eq.

[code]

set x 5

if { $x == 5 } { } this evaluates as true

if { $x eq 5 } { } this evaluates as true

if { $x == 05 } { } this evaluates as true

if { $x eq 05 } { } this evaluates as false

[/code]

== and eq will treat leading 0s in a value differently. == will basically ignore them, while eq won't, as eq treats it as part of the string.