Reduce Boolean

Prefer using .allSatisfy() or .contains() over reduce(true) or reduce(false).

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

  Key	Value
  severity	warning

Non Triggering Examples

nums.reduce(0) { $0.0 + $0.1 }

nums.reduce(0.0) { $0.0 + $0.1 }

nums.reduce(initial: true) { $0.0 && $0.1 == 3 }

Triggering Examples

let allNines = nums.↓reduce(true) { $0.0 && $0.1 == 9 }

let anyNines = nums.↓reduce(false) { $0.0 || $0.1 == 9 }

let allValid = validators.↓reduce(true) { $0 && $1(input) }

let anyValid = validators.↓reduce(false) { $0 || $1(input) }

let allNines = nums.↓reduce(true, { $0.0 && $0.1 == 9 })

let anyNines = nums.↓reduce(false, { $0.0 || $0.1 == 9 })

let allValid = validators.↓reduce(true, { $0 && $1(input) })

let anyValid = validators.↓reduce(false, { $0 || $1(input) })

nums.reduce(into: true) { (r: inout Bool, s) in r = r && (s == 3) }