checkmate: coalesce – R documentation

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coalesce

Coalesce operator

Returns the left hand side if not missing nor NULL, and the right hand side otherwise.

lhs %??% rhs

`lhs`	[any] Left hand side of the operator. Is returned if not missing or `NULL`.
`rhs`	[any] Right hand side of the operator. Is returned if `lhs` is missing or `NULL`.

Either lhs or rhs.

print(NULL %??% 1 %??% 2)
print(names(iris) %??% letters[seq_len(ncol(iris))])

Fast and Versatile Argument Checks

v2.0.0

BSD_3_clause + file LICENSE

Authors

Michel Lang [cre, aut] (<https://orcid.org/0000-0001-9754-0393>), Bernd Bischl [ctb]

Initial release