pattern_matching_keywords.md

Pattern: Unmerged pattern matching bindings

Issue: -

Description

Combine multiple pattern matching bindings by moving keywords out of tuples.

Examples of correct code:

switch foo {
    default: break
}


switch foo {
    case 1: break
}


switch foo {
    case bar: break
}


switch foo {
    case let (x, y): break
}


switch foo {
    case .foo(let x): break
}


switch foo {
    case let .foo(x, y): break
}


switch foo {
    case .foo(let x), .bar(let x): break
}


switch foo {
    case .foo(let x, var y): break
}


switch foo {
    case var (x, y): break
}


switch foo {
    case .foo(var x): break
}


switch foo {
    case var .foo(x, y): break
}

Examples of incorrect code:

switch foo {
    case (↓let x,  ↓let y): break
}


switch foo {
    case .foo(↓let x, ↓let y): break
}


switch foo {
    case (.yamlParsing(↓let x), .yamlParsing(↓let y)): break
}


switch foo {
    case (↓var x,  ↓var y): break
}


switch foo {
    case .foo(↓var x, ↓var y): break
}


switch foo {
    case (.yamlParsing(↓var x), .yamlParsing(↓var y)): break
}

Further Reading

• SwiftLint - Pattern Matching Keywords