Legacy Hashing

Prefer using the hash(into:) function instead of overriding hashValue

• Identifier: legacy_hashing
• Enabled by default: Yes
• Supports autocorrection: No
• Kind: idiomatic
• Analyzer rule: No
• Minimum Swift compiler version: 5.0.0
• Default configuration:

  Key	Value
  severity	warning

Non Triggering Examples

struct Foo: Hashable {
  let bar: Int = 10

  func hash(into hasher: inout Hasher) {
    hasher.combine(bar)
  }
}

class Foo: Hashable {
  let bar: Int = 10

  func hash(into hasher: inout Hasher) {
    hasher.combine(bar)
  }
}

var hashValue: Int { return 1 }
class Foo: Hashable { 
 }

class Foo: Hashable {
  let bar: String = "Foo"

  public var hashValue: String {
    return bar
  }
}

class Foo: Hashable {
  let bar: String = "Foo"

  public var hashValue: String {
    get { return bar }
    set { bar = newValue }
  }
}

Triggering Examples

struct Foo: Hashable {
    let bar: Int = 10

    public ↓var hashValue: Int {
        return bar
    }
}

class Foo: Hashable {
    let bar: Int = 10

    public ↓var hashValue: Int {
        return bar
    }
}