case: A cheapr case-when and switch

In cheapr: Simple Functions to Save Time and Memory

A cheapr case-when and switch

Description

case and val_match are cheaper alternatives to dplyr::case_when and dplyr::case_match respectively.

Usage

case(..., .default = NULL)

val_match(.x, ..., .default = NULL)

Arguments

...	Logical expressions or scalar values in the case of val_match.
.default	Catch-all value or vector.
.x	Vector used to switch values.

Details

val_match() is a very efficient special case of the case() function when all lhs expressions are scalars, i.e. length-1 vectors. RHS expressions can be vectors the same length as .x. The below 2 expressions are equivalent.

val_match(
  x,
  1 ~ "one",
  2 ~ "two",
  .default = "Unknown"
 )
case(
  x == 1 ~ "one",
  x == 2 ~ "two",
  .default = "Unknown"
 )

Value

A vector the same length as .x or same length as the first condition in the case of case, unless the condition length is smaller than the rhs, in which case the length of the rhs is used.

See Also

cheapr_if_else

cheapr documentation built on April 4, 2025, 4:25 a.m.