Line should not have any trailing whitespace Open
- Read upRead up
- Exclude checks
trailing-whitespace
Flag whitespace after the last non-whitespace character on each line until the newline.
Preferred
let number = 42¬
Not Preferred
let number = 42••¬
Line should not have any trailing whitespace Open
- Read upRead up
- Exclude checks
trailing-whitespace
Flag whitespace after the last non-whitespace character on each line until the newline.
Preferred
let number = 42¬
Not Preferred
let number = 42••¬
Line should not have any trailing whitespace Open
- Read upRead up
- Exclude checks
trailing-whitespace
Flag whitespace after the last non-whitespace character on each line until the newline.
Preferred
let number = 42¬
Not Preferred
let number = 42••¬
If statement should not have any line breaks before the opening brace Open
{
- Read upRead up
- Exclude checks
brace-style
Definitions of
- class
- struct
- function
- Control flow constructs (if
, else if
, else
, switch
, for
, while
, repeat-while
)
- init
- protocol
- enum
- closure
- Getters and Setters (set
, get
)
- extension
should follow the One True Brace Style (1TBS): each construct has its opening brace one the same line along with the same indentation level as its header, the statements within the braces are indented, and the closing brace at the end is on the same indentation level as the header of the function at a line of its own. Braces are not omitted for a control statement with only a single statement in its scope. Every opening brace must also have one space preceding it.
Classes
Preferred
class SomeClass {
}
class SomeClass: SomeSuperClass {
}
Not Preferred
class SomeClass
{
}
class SomeClass: SomeSuperClass{
}
Structs
Preferred
struct SomeStruct {
}
struct SomeStruct : SomeParentStruct {
}
Not Preferred
struct SomeStruct
{
}
struct SomeStruct : SomeParentStruct {
}
Functions
Preferred
func someMethod() {
}
func someOtherFunction () -> () {
}
Not Preferred
func someMethod()
{
}
func someOtherFunction () -> ()
{
}
Control flow constructs
- if, else if, and else statement
Preferred
if SomeCondition {
} else if someOtherCondition {
} else {
}
Not Preferred
if SomeCondition
{
}
else if someOtherCondition
{
}
else
{
}
- switch statement
Preferred
switch SomeData {
default:
break
}
Not Preferred
switch SomeData
{
default:
break
}
- for loop
Preferred
for var i = 0; i < 10; i+=1 {
}
Not Preferred
for var i = 0; i < 10; i+=1
{
}
- while loop
Preferred
while SomeCondition {
}
Not Preferred
while SomeCondition
{
}
- repeat-while loop
Preferred
repeat {
} while SomeCondition
Not Preferred
repeat
{
} while SomeCondition
Initializers
Preferred
init(someParameter:Double, someOtherParameter:Double) {
self.someMember = someParameter
self.someOtherMember = someOtherParameter
}
Not Preferred
init(someParameter:Double, someOtherParameter:Double)
{
self.someMember = someParameter
self.someOtherMember = someOtherParameter
}
Protocols
Preferred
protocol SomeProtocol {
}
protocol SomeOtherProtocol : X {
}
Not Preferred
protocol SomeProtocol
{
}
protocol SomeOtherProtocol : X
{
}
Enums
Preferred
enum SomeEnum {
case A, B, C, D
}
enum SomeEnum {
case A
case B
case C
case D
}
enum SomeEnum: Int {
case A, B, C = 5, D
}
Not Preferred
enum SomeEnum
{
case A, B, C, D
}
enum SomeEnum
{
case A
case B
case C
case D
}
enum SomeEnum: Int
{
case A, B, C = 5, D
}
Closures
Preferred
func someFunction () -> () {
// closure
}
Not Preferred
func someFunction () -> ()
{
// closure
}
Setters and Getters
- set
Preferred
set {
oldValue = newValue / 2
}
Not Preferred
set
{
oldValue = newValue / 2
}
- get
Preferred
get {
return value * 2
}
Not Preferred
get
{
return value * 2
}
Extensions
Preferred
extension someExtension {
}
Not Preferred
extension someExtension
{
}
Empty parentheses following method call with trailing closure argument should be removed Open
request.execute() { data, response, error in
- Read upRead up
- Exclude checks
redundant-parentheses
Control flow constructs (if
, else if
, switch
, for
, while
, repeat-while
, and guard
statements), Exception handling constructs (throw
, and do/catch
statements), and Initializers (array
, dictionary
, initializer patterns
) should not be enclosed in parentheses.
Additionally, method calls with no parameters and a trailing closure should not have empty parentheses following the method name.
Control flow constructs
- if, else if statement
Preferred
if SomeCondition {
} else if SomeOtherCondition {
}
Not Preferred
if (SomeCondition) {
} else if (SomeOtherCondition) {
}
- switch statement
Preferred
switch SomeData {
default:
break
}
Not Preferred
switch (SomeData) {
default:
break
}
- for loop
Preferred
for var i = 0; i < 10; i+=1 {
}
Not Preferred
for (var i = 0; i < 10; i+=1) {
}
- while loop
Preferred
while SomeCondition {
}
Not Preferred
while (SomeCondition) {
}
- repeat-while loop
Preferred
repeat {
} while SomeCondition
Not Preferred
repeat {
} while (SomeCondition)
- guard clause
Preferred
guard true else { }
Not Preferred
guard (true) else { }
Exception handling constructs
- do/catch statement
Preferred
do {
} catch SomeException {
}
Not Preferred
do {
} catch (SomeException) {
}
- throw statement
Preferred
throw SomeException
Not Preferred
throw (SomeException)
Initializers
- array items
Preferred
var shoppingList: [String] = ["Eggs", "Milk"]
Not Preferred
var shoppingList: [String] = [("Eggs"), ("Milk")]
- dictionary items
Preferred
var airports: [String: String] = ["YYZ": "Toronto Pearson", "DUB": "Dublin"]
Not Preferred
var airports: [String: String] = [("YYZ"): ("Toronto Pearson"), ("DUB"): ("Dublin")]
- initializer patterns
Preferred
var x: Int = 2
var y: String = "Sleekbyte"
var x = 2
Not Preferred
var x: Int = (2)
var y: String = ("Sleekbyte")
var x = (2)
Method calls
Preferred
items.map {
item in item.transform()
}
Not Preferred
items.map() {
item in item.transform()
}
Colon at column 51 should have no spaces before it Open
let jsonObject = json as? [String : Int],
- Read upRead up
- Exclude checks
colon-whitespace
There should be no whitespace preceding the colon, exactly one whitespace after the colon for:
* var
, class
, struct
, protocol
, extension
, func
, and tuple
declarations
* dict
literals and types
* case
statements
However, for conditional expressions there should be a single whitespace before and after the colon.
Variable declarations
Preferred
var x: Int = 2
Not Preferred
var x : Int
var y: String
Dictionary literals and types
Preferred
var x = [ 'key1': 1, 'key2': 2 ]
var y: [ Int: String ]
Not Preferred
var x = [ 'key1' : 1, 'key2': 3]
var y: [ Int : String ]
Case statements
Preferred
switch character {
case "a": doSomething(a);
default: alert();
}
Not Preferred
switch character {
case "a" : doSomething(a);
default: alert();
}
Class, Struct, Protocol, and Extension declarations
Preferred
class ClassName: BaseClass {
}
struct StructName: BaseStruct {
}
protocol ProtocolName: AnotherProtocol {
}
extension TypeName: ProtocolName {
}
Not Preferred
class ClassName : BaseClass {
}
struct StructName: BaseStruct {
}
protocol ProtocolName:AnotherProtocol {
}
extension TypeName : ProtocolName {
}
Tuple declarations
Preferred
var y = (key: 1, value: 2)
Not Preferred
var y = (key:1, value : 2)
Function declarations
Preferred
func someFunction<t: someclass u: someprotocol>(someT: T, someU: U) {
}</t:>
Not Preferred
func someFunction<t : someclass u:someprotocol>(someT: T, someU: U) {
}</t>
Conditional expressions
Preferred
var x = condition ? a : b
Not Preferred
var x = condition ? a: b
var x = condition ? a : b
Line should not have any trailing whitespace Open
- Read upRead up
- Exclude checks
trailing-whitespace
Flag whitespace after the last non-whitespace character on each line until the newline.
Preferred
let number = 42¬
Not Preferred
let number = 42••¬
Line should not have any trailing whitespace Open
- Read upRead up
- Exclude checks
trailing-whitespace
Flag whitespace after the last non-whitespace character on each line until the newline.
Preferred
let number = 42¬
Not Preferred
let number = 42••¬
Line should not have any trailing whitespace Open
- Read upRead up
- Exclude checks
trailing-whitespace
Flag whitespace after the last non-whitespace character on each line until the newline.
Preferred
let number = 42¬
Not Preferred
let number = 42••¬