A second version of the program in https://gist.github.com/dyoo/6407562. Make simple things more complicated! :P

count_t_words_2.go

package main

// A question from reading Barry Schwartz's "The Paradox of Choice".
//
// How many English words start with "t"?
//
// How many English words have "t" as the third letter?

import (
	"bufio"
	"fmt"
	"io"
	"os"
)

func tabulate(aReader io.Reader, preds []func(string) bool) []int {
	counts := make([]int, len(preds), len(preds))
	scanner := bufio.NewScanner(aReader)
	for scanner.Scan() {
		nextWord := scanner.Text()
		for i, pred := range preds {
			if pred(nextWord) {
				counts[i]++
			}
		}
	}
	return counts
}

func startsWithT(s string) bool {
	return len(s) > 0 && (s[0] == 't' || s[0] == 'T')
}

func hasTeeAsThirdLetter(s string) bool {
	return len(s) > 2 && (s[2] == 't' || s[2] == 'T')
}

func main() {
	counts := tabulate(os.Stdin, []func(string) bool{
		startsWithT,
		hasTeeAsThirdLetter})
	for _, c := range counts {
		fmt.Println(c)
	}
}