Elm Language Notes
So I’ve been playing with Elm and I like it quite a bit.
This is some random stuff that I find is worth sharing, in no particular order.
Elm has, as Elixir, taken the pipe operator from
But contrary to Elixir, the implement both the
<| operators. Elixir only implements
Elixir and Elm implement the right-pointing pipe with one important difference. In Elixir the left-value is passed as the first argument to the function while in Elm is the second.
This also means that in Elixir, most modules expect the first parameter to be of the type the module expects, while in Elm is the other way around.
If you’ve never seen Elm code before, you could think that it has has some unique syntax or indentation requirements.
It turns out, Elm kindle asks you to indent code in a certain way to make git (or whatever) merges and diffs more clear. It has nothing to do with the syntax.
I didnt like it at first, but I have to confess that I agree with their reasons. And now I dont find it as bad as I first thought.
If you indent this way and you add/remove from the list, the change as see in a
diff will only affect one line.
At first I was confused why the documentation for functions defines its paremeters like
instead of, in c-ish:
My head was reading: “sum returns a float, which then returns a float which finally returns a float!”
It made no sense.
Until I realized that partial application is first-class, so you can call
If you only pass one parameter, and you could!, you will get back a function that accepts the second parameter. If you then pass the second parameter you will get the final result.
You can see partial application used in the next example call of