Contains over Filter is Empty

Prefer contains over using filter(where:).isEmpty

• Identifier: contains_over_filter_is_empty
• Enabled by default: No
• Supports autocorrection: No
• Kind: performance
• Analyzer rule: No
• Minimum Swift compiler version: 5.0.0
• Default configuration:

  Key	Value
  severity	warning

Non Triggering Examples

let result = myList.filter(where: { $0 % 2 == 0 }).count > 1

let result = myList.filter { $0 % 2 == 0 }.count > 1

let result = myList.filter(where: { $0 % 2 == 0 }).count == 1

let result = myList.filter { $0 % 2 == 0 }.count == 1

let result = myList.filter(where: { $0 % 2 == 0 }).count != 1

let result = myList.filter { $0 % 2 == 0 }.count != 1

let result = myList.contains(where: { $0 % 2 == 0 })

let result = !myList.contains(where: { $0 % 2 == 0 })

let result = myList.contains(10)

Triggering Examples

let result = ↓myList.filter(where: { $0 % 2 == 0 }).isEmpty

let result = !↓myList.filter(where: { $0 % 2 == 0 }).isEmpty

let result = ↓myList.filter { $0 % 2 == 0 }.isEmpty

let result = ↓myList.filter(where: someFunction).isEmpty