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R 4.0 Improvements: stopifnot()

Bob Rudis looks at one of the R 4.0 changes hidden in the changelog:

R 4.0.0 has been out for a while, now, and — apart from a case where merge() was slower than dirt — it’s been really stable for at least me (I use it daily on macOS, Linux, and Windows). Sure, it came with some headline-grabbing features/upgrades, but I’ve started looking at what other useful nuggets might be in the changelog and decided to blog them as I find them.

Today’s nugget is the venerable stopifnot() function which was significantly enhanced by this PR by Neil Fultz.

Read on for a quality of life improvement with error handling in R.

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