tee: Tee operator

In prioritizr/ppr: Optimal Project Prioritization

Tee operator

Description

This package uses the "tee" operator (%T>%) to modify objects.

Arguments

lhs, rhs

An object and a function.

See Also

magrittr::%T>%(), pipe().

Examples

# the tee operator returns the left-hand side of the result and can be
# useful when dealing with mutable objects. In this example we want
# to use the function "f" to modify the object "e" and capture the
# result

# create an empty environment
e <- new.env()

# create a function to modify an environment and return NULL
f <- function(x) {x$a <- 5; return(NULL)}

# if we use the pipe operator we won't capture the result since "f"()
# returns a NULL
e2 <- e %>% f()
print(e2)

# but if we use the tee operator then the result contains a copy of "e"
e3 <- e %T>% f()
print(e3)

prioritizr/ppr documentation built on Sept. 10, 2022, 1:18 p.m.