#inject and slowness

I've often heard Ruby's inject method criticized as being "slow." As I rather like the function, and see equivalents in other languages, I'm curious if it's merely Ruby's implementation of the method that's slow, or if it is inherently a slow way to do things (e.g. should be avoided for non-small collections)?


inject is like fold, and can be very efficient in other languages, fold_left specifically, since it's tail-recursive.

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