explicitvariables

Richard Gaskin ambassador at fourthworld.com
Tue Feb 3 22:03:01 CET 2015


Jean-Jacques Wagner wrote:

 > What to do when the compiler does not accept new variable
 > (explicitvariables?, so it is well set to false). Your done,
 > your script is not working anymore. it disappear and come again.

Short answer:

Don't use the explicitVariables global property; use the "Strict 
Compilation Mode" option in Preferences instead.


TL/DR answer:

The explicitVariables global property was originally added to MetaCard 
for SuperCard compatibility, but neither community used it universally 
which gave rise to a problem:

If any code in the message path doesn't conform to the requirements of 
explicitVars, that script won't load and an error will be thrown.

After looking at this problem in depth, the folks at RunRev came up with 
a very clever solution that provides the strictness some prefer with 
explicitVars but also lets them use any other code that doesn't conform:

When you set the "Strict Compilation Mode" option to true in 
Preferences, explicitVariables is set to true, but only momentarily 
during compilation.  This allows the engine to detect any issues with 
non-conformance to explicitVars, but also allows any other script to be 
non-conformant without error.

So now you can write as you like to write, the authors of any libraries 
you use can write as they like to write, and all the code will play 
nicely together.

-- 
  Richard Gaskin
  Fourth World Systems
  Software Design and Development for the Desktop, Mobile, and the Web
  ____________________________________________________________________
  Ambassador at FourthWorld.com                http://www.FourthWorld.com



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