🔰closure

Swift ⟩ type ⟩ basic types ⟩ closure

Closures are functions that run in place, without the need for a name. Closures can capture and store references to any constants and variables from the context in which they are defined. This is known as closing over those constants and variables.

scene.setOnStartHandler {
    // ⭐️ body of the closure
}

The parameters in closure expression can’t have a default value.

⭐️ 重點

Closures take one of three forms:

• Global functions： have a name and don’t capture any values.

• Nested functions： have a name and can capture values from their enclosing function.

• closure expression： unnamed, can capture values from their surrounding context.

👉 see：Closures

🔴 主題

• 3 forms of closure

  • 🚧 global function

  • 🚧 nested function

  • closure expression

• function - a special case of closure.

• escaping closure

📗 參考

• Learn Swift ⟩ 2. Functions and Closures (old)

• Functional Swift: Closures {}

📘 手冊

• Functions

• Closures

👥 相關

• 📦 ViewBuilder

• non-nominal types

• function as variable

🚧

what is global function? nested function?