Find all English words by its length and sum of alphabetical value of letters

find_word_by_length_and_alphabetical_value.go

package main

import (
	"bufio"
	"fmt"
	"log"
	"os"
	"strings"
)

func main() {
	const targetValue = 42
	const targetLenght = 4
	if err := findWordValue(targetValue, targetLenght, func(word string) {
		fmt.Println(word)
		for _, c := range word {
			fmt.Printf("%s = %02d\n", strings.ToUpper(string(c)), wordValue(string(c)))
		}
	}); err != nil {
		log.Fatal(err)
	}
}

func findWordValue(targetValue, targetLength int, output func(string)) error {
	f, err := os.Open("/usr/share/dict/words")
	if err != nil {
		return err
	}
	defer f.Close()
	scanner := bufio.NewScanner(f)
	for scanner.Scan() {
		word := strings.ToLower(scanner.Text())
		if len(word) != targetLength || wordValue(word) != targetValue {
			continue
		}
		output(word)
	}
	if err := scanner.Err(); err != nil {
		return err
	}
	return nil
}

func wordValue(word string) int {
	sum := 0
	for _, c := range word {
		sum += int(c - 'a' + 1)
	}
	return sum
}