golang tour solutions

fibonacci.go

package main

import "fmt"

// fibonacci is a function that returns
// a function that returns an int.
func fibonacci() func() int {
	x, y := 0, 1

	return func() int {
		
		x, y = y, x+y
		return y
	}

}

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

loops.go

package main

import (
	"fmt"
	"math"
)

func Sqrt(x float64) float64 {

	next, prev := float64(1), float64(0)

	for math.Abs(prev-next) > 1e-15 {

		prev, next = next, next-(next*next-x)/(2*next)
	}

	return prev

}

func main() {
	fmt.Println(Sqrt(65536))
	fmt.Println(math.Sqrt(65536))
}

wordcount.go

package main

import (
	"code.google.com/p/go-tour/wc"
	"strings"
)

func WordCount(s string) map[string]int {

	resultset := make(map[string]int)

	for _, word := range strings.Fields(s) {
		resultset[word]++
	}

	return resultset
}

func main() {
	wc.Test(WordCount)
}