position: Return the position of the first object in a list that...

In michaelquinn32/lambdaList: An R Translation of Steve Losh's List Out of Lambda

Description

A predicate function is one that takes a single argument returns either true or false. position takes such a function, applies it to a functional list, and returns the position of first object where the function returns TRUE.

Usage

position(ls, fn, start = 0)

Arguments

ls	A function, with class fl, that operates as a functional list object
fn	A predicate function, as described above
start	A index of the list to begin the search (remember, cardinal numbers)

Details

Remember, in this package we use cardinal numbers, counting from 0.

Value

Either the first object that fulfills the predicate or FALSE.

See Also

funprog

michaelquinn32/lambdaList documentation built on May 22, 2019, 9:52 p.m.