Duncan Murdoch wrote:
<<- doesn't need to find z. It will replace it if found, or create a new one if not. (Personally I would have limited that to the first case, i.e. it should fail if it doesn't find z.)
Possibly. It's a holdover from S, where <<- assigns to the global environment unconditionally. (S doesn't have lexical scope, so there are effectively only two places to choose from: the function evaluation frame and the global frame -- unless you start mucking around with sys.frame, frame 0, frame 1, etc., in which case you'd use assign(...))
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