A Tour of Go solutions

46.go

// #46 Fibonacci closure

package main

import "fmt"

func fibonacci() func() int {
  x, y := 0, 1
  return func() int {
    x, y = y, x+y
    return x
  }
}

func main() {
  f := fibonacci()
  for i := 0; i < 10; i++ {
    fmt.Println(f())
  }
}

60.go

// #60 HTTP Handlers

package main

import (
  "net/http"
  "fmt"
)

type String string

func (s String) ServeHTTP(
  w http.ResponseWriter,
  r *http.Request) {
  fmt.Fprint(w, s)  
}

type Struct struct {
  Greeting string
  Punct    string
  Who      string
}

func (s Struct) ServeHTTP(
  w http.ResponseWriter,
  r *http.Request) {
  fmt.Fprint(w, s.Greeting, s.Punct, s.Who)  
}

func main() {
  http.ListenAndServe("localhost:4000", nil)
  http.Handle("/string", String("I'm a frayed know."))
  http.Handle("/struct", &Struct{"Hello", ":", "Gophers!"})
}