unused_optional_binding.md

Pattern: Use of let _ =

Issue: -

Description

Prefer != nil over let _ =.

Examples of correct code:

if let bar = Foo.optionalValue {
}


if let (_, second) = getOptionalTuple() {
}


if let (_, asd, _) = getOptionalTuple(), let bar = Foo.optionalValue {
}


if foo() { let _ = bar() }


if foo() { _ = bar() }


if case .some(_) = self {}


if let point = state.find({ _ in true }) {}

Examples of incorrect code:

if let ↓_ = Foo.optionalValue {
}


if let a = Foo.optionalValue, let ↓_ = Foo.optionalValue2 {
}


guard let a = Foo.optionalValue, let ↓_ = Foo.optionalValue2 {
}


if let (first, second) = getOptionalTuple(), let ↓_ = Foo.optionalValue {
}


if let (first, _) = getOptionalTuple(), let ↓_ = Foo.optionalValue {
}


if let (_, second) = getOptionalTuple(), let ↓_ = Foo.optionalValue {
}


if let ↓(_, _, _) = getOptionalTuple(), let bar = Foo.optionalValue {
}


func foo() {
if let ↓_ = bar {
}


if case .some(let ↓_) = self {}

Further Reading

• SwiftLint - Unused Optional Binding