| Type: | Package |
| Title: | Build Function Factories |
| Version: | 0.1.0 |
| Description: | Function factories are functions that make functions. They can be confusing to construct. Straightforward techniques can produce functions that are fragile or hard to understand. While more robust techniques exist to construct function factories, those techniques can be confusing. This package is designed to make it easier to construct function factories. |
| URL: | https://github.com/jonthegeek/factory |
| BugReports: | https://github.com/jonthegeek/factory/issues |
| License: | MIT + file LICENSE |
| Encoding: | UTF-8 |
| LazyData: | true |
| RoxygenNote: | 6.1.1 |
| Imports: | purrr (≥ 0.3.2), rlang (≥ 0.4.0) |
| Suggests: | testthat (≥ 2.1.0), covr, roxygen2, knitr, rmarkdown, ggplot2 |
| VignetteBuilder: | knitr |
| NeedsCompilation: | no |
| Packaged: | 2019-08-20 13:44:54 UTC; Jon.Harmon |
| Author: | Jon Harmon [aut, cre] |
| Maintainer: | Jon Harmon <jonthegeek@gmail.com> |
| Repository: | CRAN |
| Date/Publication: | 2019-08-21 09:00:07 UTC |
factory: Build Function Factories
Description
Function factories are functions that make functions. They can be confusing to construct. Straightforward techniques can produce functions that are fragile or hard to understand. While more robust techniques exist to construct function factories, those techniques can be confusing. This package is designed to make it easier to construct function factories.
Author(s)
Maintainer: Jon Harmon jonthegeek@gmail.com
See Also
Useful links:
Digested is
Description
Tidy evaluation uses a special parameter assignment operator, :=. See
quasiquotation for more information.
Arguments
lhs |
An expression that evaluates to a character or a symbol (used as a function parameter). |
rhs |
The thing to assign to that parameter. |
Replace Parts of a Function Body
Description
Replace quoted targets in the body of a function with quoted replacements.
Usage
body_replace(fn_body, target, replacement)
Arguments
fn_body |
The body of a function (as found via body(fun)). |
target |
A quoted expression to replace. |
replacement |
A quoted expression with which the target should be replaced. |
Value
A function body with the target replaced anywhere it occurs.
Examples
fun <- function(x) {
x^exp
}
body_replace(body(fun), quote(exp), quote(!!exp))
Easily Build Function Factories
Description
Easily Build Function Factories
Usage
build_factory(fun, ...)
Arguments
fun |
An anonymous function to turn into a factory. |
... |
Arguments for the factory function. Things on the RHS will be
evaluated before building your factory unless explicitly quoted with
|
Value
A function factory.
Examples
y <- 2
power <- build_factory(
fun = function(x) {
x^exponent
},
exponent
)
square <- power(y)
square(2)
y <- 7
square(2)