function-values-in-go

In the <a href="https://golang.org/">Go</a> programming language, <a href="https://golangr.com/methods/">functions</a> are values. That means that you can pass a function as parameter in a function.

For example, you can define a function mul which multiplies x and y. Then it returns the result.

mul := func(x, y float64) float64 {
    return x*y
}

Then you could assign the output to a variable and output it

var a float64
a = mul(3,5)
fmt.Println(a)

However, you can directly output it as a result to the print function

fmt.Println(mul(5, 12))

The program would then be:

package main

import (
    "fmt"
)

func main() {
    mul := func(x, y float64) float64 {
        return x*y
    }
    fmt.Println(mul(5, 12))
}

This results in:

60

Program exited.

Related links:

<a href="https://golang.org/">Go website</a>
<a href="https://golangr.com/">Learn Go</a>