How do I convert a float to an integer in Elixir
Use trunc(2.0) or round(2.0). Those are auto-imported since they are part of Kernel and they are also allowed in guard clauses.
elixir
Can Elixir or Erlang programs be compiled to a standalone binary?
Escripts support that to some extent but you still need Erlang installed in your machine. See this answer for more information: Elixir or Hex portable package format? EDIT: In 2023, burrito/bakeware are also valid answers, as mentioned by @Dorian.
Why can’t I chain String.replace?
EDIT On the master branch of Elixir, the compiler will warn if a function is piped into without parentheses if there are arguments. This is an issue of precedence that can be fixed with explicit brackets: price |> to_string |> String.replace(“.”, “,”) |> String.replace(~r/,(\d)$/, “,\\1 0″) |> String.replace(” “, “”) Because function calls have a … Read more
What does the slash notation in Elixir mean?
From page 2, Basic types of the Getting started documentation: Note: Functions in Elixir are identified by name and by number of arguments (i.e. arity). Therefore, is_boolean/1 identifies a function named is_boolean that takes 1 argument. is_boolean/2 identifies a different (nonexistent) function with the same name but different arity. It is also described in Erlang/Elixir … Read more
How to change field type in Ecto?
You have to use modify/3 to change the type. add/3 is only for adding new columns. alter table(:editables) do modify :content, :binary end
Testing a file upload in phoenix/elixir
Put a file in your test directory somewhere (maybe test/fixtures) then use the Plug.Upload struct: upload = %Plug.Upload{path: “test/fixtures/example.png”, filename: “example.png”} conn() |> post(“/api/v1/originals”, %{ :image => upload })
Multiline comment in Elixir
Elixir does not have multiline comments. However, one very common use case for multiline comments is documenting modules and functions, for which you can use the module attributes @doc and @moduledoc together with heredocs. defmodule MyModule do @moduledoc “”” This module is great at X “”” @doc “”” Frobnicates the given string. “”” def frobnicate(s) … Read more
How do I convert an float to an integer in Elixir
Use trunc(2.0) or round(2.0). Those are auto-imported since they are part of Kernel and they are also allowed in guard clauses.
How do I run a beam file compiled by Elixir or Erlang?
Short answer: no way to know for sure without also knowing the contents of your source file 🙂 There are a few ways to run Elixir code. This answer will be an overview of various workflows that can be used with Elixir. When you are just getting started and want to try things out, launching … Read more
Is there an identity function in Elixir?
@focused is correct – 1.10-dev has added the identity function. Documentation Old Answer: No such function has been predefined (at least that I’m aware of). It can trivially be written as you’ve done in your question, or more succinctly as &(&1).