Hangman Part-2 (get random word)

hangman.go

package main

import (
	"encoding/json"
	"fmt"
	"io/ioutil"
	"log"
	"net/http"
	"strings"
)

const MAX_CHANCES int = 8

func get_keys(entries map[string]bool) []string {
	keys := []string{}
	for k, _ := range entries {
		keys = append(keys, k)
	}

	return keys
}

// get random word from https://random-word-api.herokuapp.com/word
func get_word() string {
	// in case of any error, return "elephant"
}

func main() {
	word := get_word()

	entries := map[string]bool{}
	placeholder := make([]string, len(word), len(word))

	// initialize to '_'
	for i := range word {
		placeholder[i] = "_"
	}

	for {
		// evaluate a loss!
		if len(entries) == MAX_CHANCES {
			fmt.Println("Damn! You're hanged!!")
			fmt.Println("Word was: ", word)
			break
		}

		// evaluate a win!
		if strings.Join(placeholder, "") == word {
			fmt.Println("You win! You've saved yourself from a hanging")
			break
		}

		fmt.Println("\n")
		fmt.Println(placeholder)
		fmt.Printf("Chances left: %d\n", MAX_CHANCES-len(entries))
		fmt.Printf("Guesses: %s\n", get_keys(entries))
		fmt.Printf("Guess a letter or the word: ")

		str := ""
		fmt.Scanln(&str)
		str = strings.TrimSuffix(str, "\n")

		if str == word {
			fmt.Println("You're right - you win!")
			break
		} else if str == "" {
			// someone pressed enter direclty!
			continue
		} else if len(str) > 1 {
			fmt.Printf("Nope! %s is wrong. You lose a chance.\n", str)
			entries[str] = true
			continue
		}
		input := rune(str[0]) // take input and convert to rune (similar to char)

		found := false
		for i, e := range word {
			if input == e {
				placeholder[i] = string(input)
				found = true
			}
		}
		if !found {
			entries[string(str)] = true
		}
	}
}