The function in question is scriptSearch. I’m not much for superlatives — “most” and “best” imply one dimension, but we live in a multi-dimensional world. I’m making an exception.

The statistic I have in mind for this use of “useful” is the waiting time between calls to the function divided by the human time saved by the call.

I wrote a version of this for a company where I do consulting. There are few days working there that I don’t have at least one bout with it.  Using scriptSearch can easily save half an hour compared to what I would have done prior to having the function.

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• the R language
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