R force local scope

Question

This is probably not correct terminology, but hopefully I can get my point across.

I frequently end up doing something like:

myVar = 1
f <- function(myvar) { return(myVar); }
# f(2) = 1 now

R happily uses the variable outside of the function's scope, which leaves me scratching my head, wondering how I could possibly be getting the results I am.

Is there any option which says "force me to only use variables which have previously been assigned values in this function's scope"? Perl's use strict does something like this, for example. But I don't know that R has an equivalent of my.

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EDIT: Thank you, I am aware of that I capitalized them differently. Indeed, the example was created specifically to illustrate this problem!

I want to know if there is a way that R can automatically warn me when I do this.

EDIT 2: Also, if Rkward or another IDE offers this functionality I'd like to know that too.

question from:https://stackoverflow.com/questions/6216968/r-force-local-scope