In the Go language, function closures package a function with its external environment so that it can access the scope of the external function. Closures are often used to: 1. Access variables in the external scope; 2. Create private methods or variables; 3. Implement lazy evaluation.
Principle
Function closure is a A technique for packaging a function together with its associated environment (variables and functions) into a single unit. In this case, the inner function has access to the scope of its outer function, i.e. variables and functions.
Usage scenarios
Closures are usually used in the following scenarios:
Code example
The following Go language code example demonstrates function closure Package:
package main import "fmt" func main() { // 创建一个变量 counter := 0 // 创建一个闭包函数 increment := func() { fmt.Printf("Counter: %d\n", counter) counter++ } // 调用闭包函数 increment() increment() increment() }
Output:
Counter: 0 Counter: 1 Counter: 2
How to use it in practice
Closures have many practical uses in the Go language Application, for example:
Follow these guidelines to use closures effectively:
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