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🌷 Swift-Style Scoping Functions for Readable Code 🤗


Swift Platform CocoaPods Swift Package Manager compatible Build Status License

Scoping Functions of Swift Style for Readable Code

🌷 Usage

apply, also , let, with, run

Reture Value

The scope functions differ by the result they return:

  • apply, also return the context object.
  • let, with, and run return the closure result.

The return value of also and apply is the context object itself. so they can be included into call chains as side steps.

let org = Organization()
  .also { print("new podo org") }
  .apply {
    $0.name = "podo"
    $0.member = Member(name: "jayce", role: .owner)

They also can be used in return statements of functions returning the context object.

func newPodoOrg() -> Organization {
  Organization().apply {
    $0.name = "podo"
    $0.member = Member(name: "jayce", role: .owner)


Use apply for code blocks that don't return a value and mainly operate on the members of the receiver object.

let org = Organization().apply {
  $0.name = "podo"
  $0.member = Member(name: "jayce", role: .owner)


Use also for additional actions that don't alter the object, such as logging or printing debug information.

let member = Member(name: "jayce", role: .owner)
let org = Organization()

org.also { print("new member") }


let can be used to invoke one or more functions on result of call chains.

let numbers = [1, 5, 10]
numbers.map { $0 * 2 }
  .filter { $0 > 3}
  .let { $0.count }

let is often used for executing a code block only with non-nil values.

var org: Organization?
org = Organization(name: "podo", member: Member(name: "jayce", role: .member))

org?.member?.let {
  $0.role = .owner // $0 is not nil inside '?.let {}' 


A non-extension function: the context object is passed as an argument, and return value is the closure result.

with can be read as "with this object, do the following."

let description = with(org) {
  "Orgnaization name is \($0.name), "
    .appending("member name is \($0.member.name)")


Use run as a non-extension function. Non-extension run lets you execute a block of several statements where an expression is required.

let hexNumberRegex = run { () -> Regex in
  let digits = "0-9"
  let hexDigits = "A-Fa-f"
  let sign = "+-"

  return Regex("[\(sign)]?[\(digits)\(hexDigits)]+")

⚙️ Installation

  • Using Swift Package Manager

    import PackageDescription
    let package = Package(
      name: "MyApp",
      dependencies: [
        .package(url: "https://github.com/hb1love/Scope", .upToNextMajor(from: "2.1.0"))
  • Using CocoaPods

    pod 'Scope'

👮‍ License

Scope is available under the MIT license. See the LICENSE for details.