View Source Credo.Check.Warning.UnsafeToAtom (Credo v1.7.10)

Basics

This check is disabled by default.

Learn how to enable it via .credo.exs.

This check is tagged :controversial

This means that this check is more opinionated than others and not for everyone's taste.

This check has a base priority of high and works with any version of Elixir.

Explanation

Creating atoms from unknown or external sources dynamically is a potentially unsafe operation because atoms are not garbage-collected by the runtime.

Creating an atom from a string or charlist should be done by using

String.to_existing_atom(string)

or

List.to_existing_atom(charlist)

Module aliases should be constructed using

Module.safe_concat(prefix, suffix)

or

Module.safe_concat([prefix, infix, suffix])

Jason.decode/Jason.decode! should be called using keys: :atoms! (not keys: :atoms):

Jason.decode(str, keys: :atoms!)

or :keys should be omitted (which defaults to :strings):

Jason.decode(str)

Check-Specific Parameters

There are no specific parameters for this check.

General Parameters

Like with all checks, general params can be applied.

Parameters can be configured via the .credo.exs config file.