Higher-order functions for dealing with lists

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Description

These functions were inspired by underscore.js.

Usage

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pluck(key)

pluck_apply(key, xss)

pick(keys)

pick_apply(keys, xss)

Arguments

key

the name of a value in a list

xss

a list of lists

keys

a character vector of names in a list

Details

  • pluck: Pluck a named value from a list

  • pick: Simplify a list by picking out whitelisted names

The simple versions of pluck and pick are curried functions, meaning that they return a function which can be applied to a list. See the syntax in the usage section.

Value

pluck returns an unnamed value and pluck_apply returns a list of unnamed values. pick returns a simplified version of the original list. pick_apply returns a list of simplified lists.