GoLang -- jps sasadara

 

Install to the Ubuntu OS

https://www.systutorials.com/how-to-install-go-1-13-x-on-ubuntu-18-04/

Guide

https://docs.google.com/document/d/1ckYpi6hcRkaBUEk975f54oGsHYHu7GhzOk7-nOrkNxo/edit#

Callback: passing a func as an argument
 Supper Example 1:

       https://play.golang.org/p/AI8jKiYIKO6

 Supper Example 2:

• Supper Example 3:

package main

import "fmt"

func visit(numbers []int, callback func(int)) {
   for _, n := range numbers {
      callback(n)
   }
}

func main() {
   visit([]int{1, 2, 3, 4}, func(n int) {
      fmt.Println(n)
   })
}

// callback: passing a func as an argument

package main

import "fmt"

func filter(numbers []int, callback func(int) bool) []int {
   var xs []int
   for _, n := range numbers {
      if callback(n) {
         xs = append(xs, n)
      }
   }
   return xs
}

func main() {
   xs := filter([]int{1, 2, 3, 4}, func(n int) bool {
      return n > 1
   })
   fmt.Println(xs) // [2 3 4]
}

package main

import (
   "fmt"
)

func main() {
   ii := []int{1, 2, 3, 4, 5, 6, 7, 8, 9}
   s := sum(ii...)
   fmt.Println("all numbers", s)

   s2 := even(sum, ii...)
   fmt.Println("even numbers", s2)

   s3 := odd(sum, ii...)
   fmt.Println("odd numbers", s3)
}

func sum(xi ...int) int {
   total := 0
   for _, v := range xi {
      total += v
   }
   return total
}

func even(f func(xi ...int) int, vi ...int) int {
   var yi []int
   for _, v := range vi {
      if v%2 == 0 {
         yi = append(yi, v)
      }
   }
   return f(yi...)
}


func odd(f func(xi ...int) int, vi ...int) int {
   var yi []int
   for _, v := range vi {
      if v%2 != 0 {
         yi = append(yi, v)
      }
   }
   return f(yi...)
}