JobJob / Partial.jl

Yet Another Partial Function Application Macro

Yet Another Partial Macro

What

Create anonymous functions with fewer key strokes

sextupler = @p 6_
sextupler(5)
30

Why

There are other packages that do basically the same thing (and more), but I remember how to use mine, and this package supports multiple and numbered arguments, which others maybe don't.

Install

Unregistered for now. Pkg.clone("https://github.com/JobJob/Partial.jl.git")

Usage

Create functions whose arguments will replace the underscores.

e.g.

# setup
using Partial
type Person
    name
    weight
end
N = 10
people = [Person("Fred $i", rand(0:500)) for i in 1:N]

# magic
ages = map(@p(_.weight), people) # equiv of map(prsn->prsn.weight, people)

10-element Array{Int64,1}:
 433
 432
  85
 205
 301
  87
 385
 476
  12
 125

Even though it doesn't look that useful in the above example, in some cases it actually is.

You can also number the underscores/arguments

channels = 4
rand_image = @p rand(_1, _2, channels)
width, height = 100, 50
im = rand_image(width, height)
size(im)

(100,50,4)