Functional programming utilities

A set of wrappers for base::vapply() with some convenient defaults. Intended mainly for internal use, but available for dependent packages wherever this is deemed convenient.

Usage

chr_ply(x, fun, ..., length = 1L, use_names = FALSE)

lgl_ply(x, fun, ..., length = 1L, use_names = FALSE)

int_ply(x, fun, ..., length = 1L, use_names = FALSE)

dbl_ply(x, fun, ..., length = 1L, use_names = FALSE)

chr_mply(..., length = 1L)

lgl_mply(..., length = 1L)

int_mply(..., length = 1L)

dbl_mply(..., length = 1L)

chr_xtr(x, i, ...)

lgl_xtr(x, i, ...)

int_xtr(x, i, ...)

dbl_xtr(x, i, ...)

lst_xtr(x, ...)

map(fun, ..., use_names = FALSE)

filter(fun, x, ...)

Arguments

x

Object to iterate over

fun

Function to apply to each component

...

Forwarded to fun

length

Expected result length

use_names

Name the result using names(x)

i

Index to extract

Value

The result of a call to base::lapply(), base::vapply() or base::Map().