##Week 11 Homework for Node.js #Introduction
#You will be creating a Hangman Game.
Building it with Constructor functions.
It will be a command line node app that will take in prompted text as an input.
We will build this game step by setup one piece at a time.
#Part 0: Setup
Install the npm package prompt npm install prompt --save #Part 1: Making the letter Constructor
create a file called
letter.js
Start by creating a constructor function named Letter
it should take an argument let create a property called charac which will store the argument let create a property called appear set it to false create a function inside of the Letter constructor called letterRender when the function letterRender is called it will check the value of charac if false return a string "_", else it will return the value charac export the Letter constuctor function with
module.exports = Letter;
#Part 2: Making the Word Constructor
create a file called
word.js
Start by importing the letter.js file by using require, set it to a variable called Letter
Create a constructor function named Word
it should take an argument wrd create a property called word which will store the argument wrd create a property called lets which is set to an empty array create a property called found which is set to false create a function inside of Word constructor called getLets
it will run a loop that iterate over each of the letter in the word property everytime the loop iterates, it creates a new Letter object with the argument being the current letter Hint: this function will create Letter objects that will be put into the lets array After this function runs, the property lets will contain Letter objects for each of the letter in word
create a function inside of Word constructor called checkIfLetterFound
this function will take an argument guessLetter create an varaible called whatToReturn and set it to the number 0 it will run a loop that iterate over each object in the lets array check the current object that’s being iterated over if the charac property in that object is equal to guessLetter, set the appear property of that object to true add 1 to checkIfLetterFound return checkIfLetterFound Hint: the objects in lets array are created with the Letter constructor, with all the property created in Letter constructor
create a function inside of Word constuctor called didWeFindTheWord
call the .every() method on the lets array .every() method takes in an anonymous function as argument, that function will take an argument curLet set the property found to true if all letter objects have the true value in their appear property return found Hint: look up .every to see how it works on array. the goal here is to have the didWeFindThWord function check if all the objects in lets array has appear property of true, if so then the function return true
create a function inside of Word constuctor called wordRender
create a varaible called str set it to "" empty string it will run a loop that iterate over each object in let array everytime the loop iterates, calling the letterRender on that object and then string concatenate that to the varaible str return str export the Word constuctor function with
module.exports = Word;
#Part 3: Making the Game
create a file called main.js Start by importing npm prompt by using require, set it to a variable called prompt
call the .start() method on prompt Importing the word.js file by using require, set it to a variable called Word
Create an object called game
create a key named wordBank with the value of: an array contain strings, these are the works that the user will try to guess create a key named guessesRemaining with the value of: 10 create a key named currentWrd with the value of: null create a function named startGame with an argument of wrd create a new Word object with an argument of a string from your wordBank, a random word set the newly created Word object to currentWrd called .getLets() method on the currentWrd object call the keepPropmtingUser() function with no argument, we haven’t build keepPropmtingUser yet but will shortly Hint: currentWrd is now an object created with Word constructor it have all the function created in Word constructor
create a function named keepPropmtingUser with no argument
create a variable named self set it to this Hint: because when we are going inside the prompt object out this will lose scope, we must store this inside of self
called the prompt.get() function with two arguments
Hint: look up how npm prompt works
first argument is an array with one element, a string named guessLetter
second argument is an anonymous function the anonymous function has two arguments as well (err, result), the anonymous function will
console logs (“The Letter or space you guessed is ” + result.guessLetter) create a variable named findHowManyOfUserGuess, set it to currentWrd.checkIfLetterFound(result.guessLetter) *Hint: this checks if the letter was found and if so, sets that specific letter object to appear, it also returns a number
check if findHowManyOfUserGuess is 0
if is 0, console log (“You gusses wrong~!”) minus 1 from the value guessesRemaining else
console log (‘You guessed right!’) check if user has won the game if function currentWrd.didWeFindTheWord() returns true console log (‘You Won!!!’) return 1 to end the game console log(‘Guesses remaining: ‘ + value of guessesRemaining);
console log( call the wordRender() method on currentWrd ) *Hint: this will display all the letters guessed, if correct display as letters and “_” has hidden letters not yet guessed correctly”
if the value guessesRemaining is greater than 0 and the property currentWrd.found is false
called the function keepPromptingUser() Hint: Yes we calling a function inside of itself the if statment stops the recursion from going infinite else if the value guessesRemaining is equal to 0 console log “Game over bro” and the word user was guessing else console log (call the function .wordRender() on currentWrd) start the game by calling game.startGame()