In RDocTaskForce/postlogic: Infix and Postfix Logic Operators

knitr::opts_chunk$set(
  collapse = TRUE,
  comment = "#>",
  fig.path = "man/figures/README-",
  out.width = "100%"
)
library(postlogic)

postlogic

The goal of postlogic is to allow natural flowing logic statements.

Installation

You can install the released version of postlogic from CRAN with:

install.packages("postlogic")

If/Otherwise

The if/otherwise instruction allows for simple logic to follow a statement to make it conditional. The %if% can be used alone to make an action conditional.

verbose <- TRUE 
message("Hello there") %if% verbose

When combined with the %otherwise% statement it allows for an alternate.

mood <- "calm"
message("How dare you!") %if% (mood == 'angry') %otherwise% 
    message("Everything is fine.")

mood <- 'angry'
message("How dare you!") %if% (mood == 'angry') %otherwise% 
    message("Everything is fine.")

Unless/Then

The %unless% operator is essentially the negation of %if%. So when a statement is postfixed by an %unless% statement it will happen unless the proposition returns TRUE. The alternating operator for %unless% is %then%.

mood <- 'calm'
message("Everything is fine.") %unless% (mood == 'angry') %then% 
    message("How dare you!")

This example is the same effect as the statements in the previous example.

Documentation

The postlogic package is developed by the R Documentation Task Force, an R Consortium Infrastructure Steering Committee working group.

RDocTaskForce/postlogic documentation built on May 30, 2019, 1:23 p.m.