Enable SwiftLint zero-violation rules (10 rules)

.swiftlint.yml

@@ -11,15 +11,27 @@ excluded:
   - vendor
 
 only_rules:
+  # Prefer `Array(xs)` over `xs.map { $0 }`.
+  - array_init
+
   # Colons should be next to the identifier when specifying a type.
   - colon
 
   # There should be no space before and one after any comma.
   - comma
 
+  # Prefer `contains` over `filter(where:).count`.
+  - contains_over_filter_count
+
   # Prefer `contains` over using `filter(where:).isEmpty`.
   - contains_over_filter_is_empty
 
+  # Prefer `contains` over `first(where:) != nil`.
+  - contains_over_first_not_nil
+
+  # Prefer `contains` over `range(of:) != nil` and `range(of:) == nil`.
+  - contains_over_range_nil_comparison
+
   # if,for,while,do statements shouldn't wrap their conditionals in parentheses.
   - control_statement
 
@@ -39,6 +51,15 @@ only_rules:
   # Empty strings should be compared to `""` only if `isEmpty` cannot be used.
   - empty_string
 
+  # Prefer `first(where:)` over `filter { }.first`.
+  - first_where
+
+  # Prefer `flatMap { ... }` over `map { ... }.reduce([], +)`.
+  - flatmap_over_map_reduce
+
+  # Prefer `last(where:)` over `filter { }.last`.
+  - last_where
+
   # MARK comment should be in valid format.
   - mark
 
@@ -50,10 +71,19 @@ only_rules:
   # over `CGPoint(x: 0, y: 0)`).
   - prefer_zero_over_explicit_init
 
+  # Prefer `reduce(into:_:)` over `reduce(_:_:)` for non-trivial accumulator types.
+  - reduce_into
+
+  # `nil` coalescing on a non-optional is redundant.
+  - redundant_nil_coalescing
+
   # Use shorthand syntax for optional binding (`if let foo` instead of
   # `if let foo = foo`).
   - shorthand_optional_binding
 
+  # Prefer `min(by:)` / `max(by:)` over `sorted { ... }.first` / `.last`.
+  - sorted_first_last
+
   # Files should have a single trailing newline.
   - trailing_newline