func (b *Block) GenerateMerkelRoot() []byte {
var merkell func(hashes [][]byte) []byte
merkell = func(hashes [][]byte) []byte {
l := len(hashes)
if l == 0 {
return nil
}
if l == 1 {
return hashes[0]
} else {
if l%2 == 1 {
return merkell([][]byte{merkell(hashes[:l-1]), hashes[l-1]})
}
bs := make([][]byte, l/2)
for i, _ := range bs {
j, k := i*2, (i*2)+1
bs[i] = helpers.SHA256(append(hashes[j], hashes[k]...))
}
return merkell(bs)
}
}
ts := functional.Map(func(t Transaction) []byte { return t.Hash() }, []Transaction(*b.TransactionSlice)).([][]byte)
return merkell(ts)
}
func draw(r Race) {
drawing := f.Map(func(car Car) string {
return f.Reduce(func(a string, i int) string {
return a + "-"
}, make([]int, car.Position), "").(string)
}, r.Cars).([]string)
fmt.Println("............................")
f.Map(func(a string) interface{} {
fmt.Println(a)
return a
}, drawing)
}
func main() {
words := []string{"doing", "go", "functional", "programming"}
numbers := []int{1, 2, 3}
fmt.Println("MAP")
fmt.Println("Square", numbers, f.Map(func(x int) int { return x * x }, numbers))
fmt.Println("Length", words, f.Map(func(x string) int { return len(x) }, words))
fmt.Println("Hash", words, f.Map(hash, words))
fmt.Println("REDUCE")
fmt.Println("Sum", numbers, f.Reduce(func(a int, x int) int { return a + x }, numbers, 0))
fmt.Println("Total length", words, f.Reduce(func(a int, x string) int { return a + len(x) }, words, 0))
fmt.Println("FILTER")
fmt.Println("Long words (>5)", words, f.Filter(func(x string) bool { return (len(x) > 5) }, words).([]string))
}
func carState(cars []Car) []Car {
return f.Map(func(c Car) Car {
if helpers.RandomInt(0, 3) == 0 {
return Car{Position: c.Position + 1}
}
return Car{Position: c.Position}
}, cars).([]Car)
}
func main() {
root, err := GitDirectoryRoot()
if err != nil {
fmt.Println("You must use todos inside a git repository")
} else {
if len(flag.Args()) < 1 {
showHelp()
} else {
mode := flag.Args()[0]
switch mode {
case "setup":
setup(root)
case "work":
// Try to read lines from Stdin, if not talk to git
diff, err := ReadStdin()
if len(diff) == 0 {
diff, err = GitDiffFiles()
logOnError(err)
}
diff = functional.Map(func(s string) string { return path.Join(root, s) }, diff).([]string)
work(root, diff)
default:
showHelp()
}
}
}
}