Should I always put setlocal enableDelayedExpansion at the start a batch script, even when I don't need it?
Does it have any impact on performance, or will it cause any problem?
Should I always enable delayed expansion for a whole batch script?
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1 Answers
I enable delayed expansion nearly always at the beginning of any batch file.
Because it has two main advantages:
- Expansion of
!varname!is evaluated when the expression is executed, not when it is parsed, like percent expansion, this avoid many problems - The expanded content is always safe and will not be (re)parsed further, special characters doesn't harm
- The setlocal prevents the environment of polution with local variables
The only drawback is the handling of exclamation marks itself.
But even that can be solved with some glue code
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