closure.go

package main

import "fmt"

// outerFunction returns a closure (an inner function) that captures and uses the variable 'x'
func outerFunction(x int) func(int) int {
    // The inner function, which forms a closure
    return func(y int) int {
        return x + y  // 'x' is captured from outerFunction's scope
    }
}

func main() {
    // Create a closure by calling outerFunction with 'x' set to 5
    closure := outerFunction(5)

    // Call the closure with different values of 'y'
    fmt.Println(closure(3))  // Output: 8
    fmt.Println(closure(7))  // Output: 12
}