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#> Hello there

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

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!")
#> Everything is fine.

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 ConsortiumInfrastructure Steering Committee working group.