%??% {checkmate}

Coalesce operator

Description

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

Usage

lhs %??% rhs

Arguments

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.

Value

Either lhs or rhs.

Examples

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