Refactoring is essential

Introduction

What is refactoring?

// Before refactoring
package main

import "fmt"

func main() {
    fmt.Println(add(2, 3))
    fmt.Println(subtract(5, 2))
}

func add(x int, y int) int {
    return x + y
}

func subtract(x int, y int) int {
    return x - y
}

// After refactoring
package main

import "fmt"

func main() {
    fmt.Println(calculate(2, 3, add))
    fmt.Println(calculate(5, 2, subtract))
}

func add(x int, y int) int {
    return x + y
}

func subtract(x int, y int) int {
    return x - y
}

func calculate(x int, y int, operation func(int, int) int) int {
    return operation(x, y)
}

This article presents a simple refactoring example in Go language. It starts with two basic functions for addition and subtraction. The code is then refactored to include a new function 'calculate' which accepts the operation as a parameter. This demonstrates how to make the code more flexible and reusable by abstracting the operation.

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