All functions

All

Test if all items in an object evaluate to TRUE. 
Always

Create a function that that always returns a specific object. 
Andify

Predicate function operator that creates new predicate functions linked by the && operator. 
Any

Test if any items in an object evaluate to TRUE. 
Apply

Wrapper for apply function. 
Best

Find the best value in a vector. 
Compact

Filter NA and NULL values out of a vector, list, or data.frame. 
Compose %O%

Compose multiple functions. 
Existy

Tests the "existiness" of an object. 
Fail_With

Fail with a default value. 
False

Return the value FALSE. 

functools: Tools for Functional Programming in R 
Identity

Return the object passed to it. 
Lapply

Wrapper for lapply function. 
Mapply

Wrapper for mapply function. 
Memoise

Memoise a function. 
Na

Return the value NA. 
Null

Return the value NULL. 
Orify

Predicate function operator that creates new predicate functions linked by the  operator. 
Partial

Partial apply a function, filling in some arguments. 
Reduce_Right

Simple wrapper for Reduce, proceeding from the right. 
Reject

Reject values for which a predicate function returns TRUE. 
Sapply

Wrapper for sapply function. 
Tapply

Wrapper for tapply function. 
True

Return the value TRUE. 
Truthy

Tests the "truthiness" of an object. 
Vapply

Wrapper for vapply function. 