ExSlop.Check.Refactor.LengthInGuard (ExSlop v0.4.2)

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Basics

This check is disabled by default.

Learn how to enable it via .credo.exs.

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

Explanation

length/1 in guards traverses the list whenever the clause is considered.

# bad
def empty?(list) when length(list) == 0, do: true

# good
def empty?([]), do: true

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.