Operator Providing Alternative to Zero-Length Object

Infix function implementing provision of an alternative if an object has zero length.

Usage

x %L% y

Arguments

x, y

atomic vector arguments or other objects for which length() is defined.

Value

x, or if length(x) is zero, y.

Details

The infix function %L% may be useful in implementing if (length(x)) x else y and was inspired by the null coalescing operator %||%.

See also

%||%.

Examples

c4 <- letters[1:4]
c0 <- character(0)
n3 <- 1:3
n0 <- numeric(0)

c4 %L% n3
#> [1] "a" "b" "c" "d"
c0 %L% n3
#> [1] 1 2 3

n3 %L% c4
#> [1] 1 2 3
n0 %L% c4
#> [1] "a" "b" "c" "d"

rm(c4, c0, n3, n0)