What Are Pointers in Go and Why Use Them

Pointers in Go are variables that store the memory address of another variable, allowing you to modify the original value directly or pass large data structures efficiently without copying them. Use pointers when you need to mutate a value inside a function or avoid the performance cost of copying large structs.

package main

import "fmt"

func main() {
	// Create a variable
	val := 10
	// Create a pointer to that variable
	ptr := &val
	
	// Modify the value via the pointer
	*ptr = 20
	
	fmt.Println(val) // Output: 20
}

A pointer is like a house address on a piece of paper; it doesn't hold the house itself, but tells you exactly where to find it. You use pointers when you need to change something in a different part of your program without making a duplicate copy, which saves memory and time. Think of it as giving someone the location of your file instead of emailing them the entire file every time they need to edit it.