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Is it a requirement of good TCL code? What would happen if we don’t use the “unset” keyword in a script? Any ill-effects I should know about?
I’m inheriting some legacy code and the errors that come about due to “unset”-ing non-existent variables are driving me up the wall!
It’s possible to determine whether a variable exists before using it, using the
info existscommand. Be sure that if you’re not usingunset, that you don’t upset the logic of the program somewhere else.There’s no Tcl-specific reason to
unseta variable, that is, it’s not going to cause a memory leak or run out of variable handles or anything crazy like that. Usingunsetmay be a defensive programming practice, because it prevents future use of a variable after it’s no longer relevant. Without knowing more about the exact code you’re working with, it’s hard to give more detailed info.