How to write more efficient and maintainable code with Go language closures

Go language closure (Closure) is a powerful feature that is very helpful for understanding function programming and higher-order functions. In this article, we will take a deep dive into the concept, principle and use of Go language closure, and will provide some specific example code.

#1 What is closure?

Closure means that a function can access variables defined outside of it. Specifically, closure can access variables outside the function by defining another function inside the function and returning this function. This returned function is called closure.

In Go, a closure consists of a function and its associated reference environment. A reference environment is a collection of all variables referenced in a function that may not be in the same scope when the function is defined. When a function executes, its reference environment is stored and persists after the function returns. In this way, closures can access and modify variables in this reference environment.

#2 Implementation principle of closure

In Go, the implementation of closure depends on the return type of function. Specifically, if a function returns a function type, then the function is a closure.