# BackPipe
[](https://hex.pm/packages/back_pipe)
A simple backwards pipe operator for Elixir via the `~>` operator. Lets you pipe the output of preceding logic into the final argument position of the next function.
### Why?
Why not!
But really, this is mostly an experiment. Elixir provides both a set of reserved operators that can be overloaded and a macro system to do so. Plus, the backwards pipe operator is not a novel concept. Some other functional languages like F#, have them. This is a study of what it could look like in Elixir.
Also, it does feel useful for the small handful of cases where the final argument in a function is often the result of a chain (i.e. pipeline) of operations, like when calling `struct/2` to dynamically generating new structs.
## Docs
On [Hexdocs](https://hexdocs.pm/back_pipe/BackPipe.html)
## Installation
Add `back_pipe` to your list of dependencies in `mix.exs`:
```elixir
def deps do
[
{:back_pipe, "~> 0.1.0"}
]
end
```
## Examples
```elixir
# Basic usage
iex> "hello world" ~> String.split()
["hello", "world"]
# We can chain too
"hello world"
~> String.split()
~> Enum.concat(["oh"])
|> Enum.join(" ")
# "oh hello world"
# More useful: dynamically creating a struct
defmodule Traveler do
defstruct [:id, :name, :location]
def new(kwl) do
kwl
|> Map.new()
|> Map.put(:location, "Unknown")
~> struct(__MODULE__)
end
end
iex> Traveler.new(id: 1, name: "Hal")
%Traveler{id: 1, location: "Unknown", name: "Hal"}
```
