purrr draws inspiration from many related tools:
List operations defined in the Haskell prelude
Scala's list methods.
rlist, another R package to support working with lists. Similar goals but somewhat different philosophy.
However, the goal of purrr is not to try and simulate a purer functional programming language in R; we don't want to implement a second-class version of Haskell in R. The goal is to give you similar expressiveness to an FP language, while allowing you to write code that looks and works like R:
Instead of point free (tacit) style, we use the pipe,
%>%, to write code
that can be read from left to right.
Instead of currying, we use
... to pass in extra arguments.
Before R 4.1, anonymous functions were verbose, so we provide two convenient shorthands.
For unary functions,
~ .x + 1 is equivalent to
function(.x) .x + 1.
R is weakly typed, so we need
map variants that describe the output type
map_dbl(), etc) because we don't know the return type of
R has named arguments, so instead of providing different functions for
minor variations (e.g.
detectLast()) we use a named
.right. Type-stable functions are easy to reason about so
additional arguments will never change the type of the output.
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