Golang Basic

closure.go

// Closure is a function which can be stored on a variable

package main 

import {
  "fmt"
}

func main() {
	var numbers = []int{2, 3, 4, 5, 6, 7, 8, 9}

  	var getMinMax = func(n []int) (int, int) {
  		var min, max int
		for i, e := range n {
			switch {
			case i == 0:
				max, min = e, e
			case e > max:
				max = e
			case e < min:
				min = e
			}
		}
		return min, max
	  }
  
	  min, max := getMinMax(numbers)
	  fmt.Println("Original data: ", numbers)
	  fmt.Println("Min: ", min)
	  fmt.Printf("Max: %d\n\n", max)
}

iife.go

// IIFE --> Immediately Invoked Function Expression
// A closure which is being invoked at the time of its creation

package main 

import {
  "fmt"
}

func main() {
  	var numbers = []int{2, 3, 4, 5, 6, 7, 8, 9}

	var newNumbers = func(min int) []int {
		var r []int
		for _, e := range numbers {
			if e < min {
				continue
			}
			r = append(r, e)
		}
		return r
	}(4)

	fmt.Println("original number : ", numbers)
	fmt.Println("filtered number : ", newNumbers)
}