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Ganesh Kumar
Ganesh Kumar

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Understanding Anonymous Functions in Go

#go

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In my previous post, I explained what are maps and how to create them.

Now let's see how anonymous functions created and understand how it works.

Anonymous functions

We assign a function to a variable and then call it.


package main

import "fmt"


func main() {
    data := func() {
        fmt.Println("Hello World")
    }

    data()
}
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Hello World
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Similarly we can also pass arguments to the anonymous function.


package main

import "fmt"


func main() {
    data := func(a,b string) {
        fmt.Println(a,b)
    }

    data("dev","to")
}
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Output:

dev to
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Passing function as an argument

We are passing a function as an argument to another function.


package main

import "fmt"

func anonymous(a func()) {
    a()
}
func main() {
    data := func() {
        fmt.Println("Hello World")
    }
    anonymous(data)
}
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Output:

Hello World
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If we want to pass arguments to the anonymous function, we can do it like this:


package main

import "fmt"

func anonymous(a func(string,string)) {
    a("dev","to")
}
func main() {
    data := func(a,b string) {
        fmt.Println(a,b)
    }
    anonymous(data)
}
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As is the print statement is inside the anonymous function, it is printing the values passed to it.

Output:

dev to
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Conclusion

We understood how the anonymous functions are created and how to pass them as arguments to another function.

As go has the feature of passing functions as arguments to another function, go provides a feature called closure.

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View on GitHub


https://github.com/golang/go/blob/master/src/runtime/slice.go

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