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A general description is here.
‘checkRdContents()’ is now exported from ‘tools’; it and also ‘checkDocFiles()’ have a new option ‘chkInternal’ allowing to check Rd files marked with keyword ‘"internal"’ as well. The latter can be activated for ‘R CMD check’ via environment variable ‘_R_CHECK_RD_INTERNAL_TOO_’.
R now provides a shorthand notation for creating functions, e.g. ‘\(x) x + 1’ is parsed as ‘function(x) x + 1’.
R now provides a simple native forward pipe syntax ‘|>’. The simple form of the forward pipe inserts the left-hand side as the first argument in the right-hand side call. The pipe implementation as a syntax transformation was motivated by suggestions from Jim Hester and Lionel Henry.