First Where

Prefer using .first(where:) over .filter { }.first in collections

• Identifier: first_where
• 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

kinds.filter(excludingKinds.contains).isEmpty && kinds.first == .identifier

myList.first(where: { $0 % 2 == 0 })

match(pattern: pattern).filter { $0.first == .identifier }

(myList.filter { $0 == 1 }.suffix(2)).first

collection.filter("stringCol = '3'").first

realm?.objects(User.self).filter(NSPredicate(format: "email ==[c] %@", email)).first

if let pause = timeTracker.pauses.filter("beginDate < %@", beginDate).first { print(pause) }

Triggering Examples

↓myList.filter { $0 % 2 == 0 }.first

↓myList.filter({ $0 % 2 == 0 }).first

↓myList.map { $0 + 1 }.filter({ $0 % 2 == 0 }).first

↓myList.map { $0 + 1 }.filter({ $0 % 2 == 0 }).first?.something()

↓myList.filter(someFunction).first

↓myList.filter({ $0 % 2 == 0 })
.first

(↓myList.filter { $0 == 1 }).first

↓myListOfDict.filter { dict in dict["1"] }.first

↓myListOfDict.filter { $0["someString"] }.first