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Golang - Passing of functions as arguments Code Example

Here is the solution for "Passing of functions as arguments" in Golang.

Golang code for Passing of functions as arguments

package main

import "fmt"

// convert types take an int and return a string value.
type convert func(int) string

// value implements convert, returning x as string.
func value(x int) string {
	return fmt.Sprintf("%v", x)
}

// quote123 passes 123 to convert func and returns quoted string.
func quote123(fn convert) string {
	return fmt.Sprintf("%q", fn(123))
}

func main() {
	var result string

	result = value(123)
	fmt.Println(result)
	// Output: 123

	result = quote123(value)
	fmt.Println(result)
	// Output: "123"

	result = quote123(func(x int) string { return fmt.Sprintf("%b", x) })
	fmt.Println(result)
	// Output: "1111011"

	foo := func(x int) string { return "foo" }
	result = quote123(foo)
	fmt.Println(result)
	// Output: "foo"

	_ = convert(foo) // confirm foo satisfies convert at runtime

	// fails due to argument type
	// _ = convert(func(x float64) string { return "" })
}