Unused Enumerated

When the index or the item is not used, .enumerated() can be removed.

• Identifier: unused_enumerated
• 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

for (idx, foo) in bar.enumerated() { }

for (_, foo) in bar.enumerated().something() { }

for (_, foo) in bar.something() { }

for foo in bar.enumerated() { }

for foo in bar { }

for (idx, _) in bar.enumerated().something() { }

for (idx, _) in bar.something() { }

for idx in bar.indices { }

for (section, (event, _)) in data.enumerated() {}

list.enumerated().map { idx, elem in "\(idx): \(elem)" }

list.enumerated().map { $0 + $1 }

list.enumerated().something().map { _, elem in elem }

list.enumerated().map { ($0.offset, $0.element) }

list.enumerated().map { ($0.0, $0.1) }

list.enumerated().map {
    $1.enumerated().forEach { print($0, $1) }
    return $0
}

Triggering Examples

for (↓_, foo) in bar.enumerated() { }

for (↓_, foo) in abc.bar.enumerated() { }

for (↓_, foo) in abc.something().enumerated() { }

for (idx, ↓_) in bar.enumerated() { }

list.enumerated().map { idx, ↓_ in idx }

list.enumerated().map { ↓_, elem in elem }

list.↓enumerated().forEach { print($0) }

list.↓enumerated().map { $1 }

list.enumerated().map {
    $1.↓enumerated().forEach { print($1) }
    return $0
}

list.↓enumerated().map {
    $1.enumerated().forEach { print($0, $1) }
    return 1
}

list.↓enumerated().forEach {
    let (i, _) = $0
}