什么时候在Go中使用函数表达式而不是函数声明？

Question

When to use functioneExpression rather than function declaration in Go?

I searched Function Expression vs Function Declaration (in JS), it's about hoisting. How about Golang?

Answer 1

Anonymous functions in Go are used in various situations:

- to start a goroutine

go func() {
    // body
}()

- with a defer statement

defer func() {
    // body
}()

- as an argument to another function

err := filepath.Walk(root, func(path string, info os.FileInfo, err error) error {
    // todo
})

- as a closure (examples)

Function declarations are used when you want to refer to the function by name. Maybe to call it from multiple places in your own code, or to expose it to other packages.