[Go] Concurrent generators.

package main

import (
    "fmt"
    "strings"
)

func main() {
    data := []string{
        "The yellow fish swims slowly in the water",
        "The brown dog barks loudly after a drink from its water bowl",
        "The dark bird of prey lands on a small tree after hunting for fish",
    }

    histogram := make(map[string]int)
    wordsCh := make(chan string)

    go func() {
        defer close(wordsCh)

        for _, line := range data {
            words := strings.Split(line, " ")

            for _, word := range words {
                word = strings.ToLower(word)
                wordsCh <- word
            }
        }
    }()

    for {
        word, opened := <- wordsCh
        if !opened {
            break
        }
        histogram[word]++
    }

    for k, v := range histogram {
        fmt.Println(fmt.Sprintf("%s\t(%d)", k, v))
    }
}