Rule Request: Empty Array Literal

[idrougge]

New Issue Checklist

• Updated SwiftLint to the latest version
• I searched for existing GitHub issues

New rule request

Prefer checking isEmpty over comparing string to an empty array literal.

This reflects the behaviour already implemented by empty_string.

What would trigger

if myArray == [] { … }

guard list != [] else { return }

if [] == anArray { … }

theArray==[] ? return : f(theArray)

What would not trigger

let myArray = []

if myArray.isEmpty { … }

guard list.isEmpty else { return }

if myArray == [1, 2, 3] { … }

3. Should the rule be configurable, if so what parameters should be configurable?

No.

4. Should the rule be opt-in or enabled by default? Why?

Same as for empty_string.