Posted on Feb 27, 2022 • Edited on Mar 1, 2022

Project 5: Random number game in Javascript

Random number can be generated easily in Javascript. Hence, by using it we can build a game to guess a number.

If we are building a random number between 1-10 range, then guessing in between will be a fun.

Let's have a look at the code here first:

<html> <body> <p>Guess the number between 1-10</p> <input id="guessed" type="text" style="padding: 5px" /> <button onclick="verify()">Submit!</button> <script> function verify() { const value = document.getElementById('guessed').value; const getRandom = Math.floor((Math.random() * 10 + 1)); const p = document.createElement('p'); if (value == getRandom) { p.innerHTML = 'You have successfully guessed the right number.'; } else { p.innerHTML = `You havent guessed the random number i.e.${getRandom}. Please try again!`; } document.body.append(p); } </script> </body> </html>

Let's go through line by line to understand it.

<p>Guess the number between 1-10</p> <input id="guessed" type="text" style="padding: 5px" /> <button onclick="verify()">Submit!</button>

p -> shows the mentioned message on web page.
input -> allows user to enter the number.
button -> to perform action after entering.

onclick="verify()" is the one responsible to perform validation against the random number with given number.

Ok. now, what is there inside the verify()?

const value = document.getElementById('guessed').value; - get you the value entered by user.

const getRandom = Math.floor((Math.random() * 10 + 1)); - calculates random number between 1-10. To dig little deeper, Math.random() generates number from 0(inclusive)-1(exclusive).

Let's say, Math.random()given value as 0.23... * 10 gives 2.3.. + 1 gives 3.3... Hence, Math.floor(3.3) - 3.

const p = document.createElement('p'); - creates p element.

In if...else, setting ps innerHtml the message to show to the user based on the matching condition.

document.body.append(p); - once we set message to p then appending it to body to show on web page.

Depends of the range we need we can update Math.random() * 10 + 1.

at last, here is the result: