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JavaScript JavaScript Loops, Arrays and Objects Simplify Repetitive Tasks with Loops What are Loops?

Posted by adensaid
adensaid
4,461 Points

what is wrong with my javascript file because every time I try to preview I got nothing except a title on the page?

Let’s Make Random Numbers --- is all i see on top-left corner of the page.

can anyone elaborate what I am missing? Thanks

jag
jag
18,266 Points
jag
jag
18,266 Points

Have you checked your browser's console? Other than that without showing your code it's hard to tell.

4 Answers

Sergey Podgornyy
Sergey Podgornyy
20,660 Points
Sergey Podgornyy
Sergey Podgornyy
20,660 Points

First, please provide your code here

adensaid
adensaid
4,461 Points

this is my javascript code:

function randomNumber(upper) { return Math.floor( Math.random() * upper ) + 1; } var counter = 0; while ( counter < 10000 ) { var randNum = randomNumber(6); document.write(randNum + ' '); counter += 1; }

and this is my html code:

<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Let’s Make Random Numbers</title> <link rel="stylesheet" href="styles.css"> </head> <body> <h1>Let’s Make Random Numbers</h1> <script src="video2-script.js"></script> </body> </html>

Sergey Podgornyy
Sergey Podgornyy
20,660 Points
Sergey Podgornyy
Sergey Podgornyy
20,660 Points

You need to write you while loop on proper way. Like in code below:

function randomNumber(upper) { 
    return Math.floor( Math.random() * upper ) + 1; 
}

var counter = 0; 
while ( counter < 10 ){
    var randNum = randomNumber(6);
    document.write(randNum + ' '); 
    counter++; 
}

This code will generate 10 random numbers - https://jsfiddle.net/k53kxof1/

adensaid
adensaid
4,461 Points
adensaid
adensaid
4,461 Points

Thanks Sergey, that helpful at the end!

adensaid
adensaid
4,461 Points
adensaid
adensaid
4,461 Points

hey Sergey!

Do you know how I can setup my own javascript environment so that I can code along with the instructor as he teaches the lessons?

Sergey Podgornyy
Sergey Podgornyy
20,660 Points
Sergey Podgornyy
Sergey Podgornyy
20,660 Points

You can use treehouse Workspaces, but I suggest you to write all your code locally and preview it on browser. The best text editor for me is Sulime Text with Emmet plugin

jason chan
jason chan
31,009 Points
jason chan
jason chan
31,009 Points 
var questions = [
  {
    question: 'How many states are in the United States?', 
    answer: 50
  },
  {
    question: 'How many continents are there?',
    answer: 7
  },
  {
    question: 'How many legs does an insect have?', 
    answer: 6
  }
];
var correctAnswers = 0;
var question;
var answer;
var response;

function print(message) {
  document.write(message);
}

for (var i = 0; i < questions.length; i += 1) {
  question = questions[i].question;
  answer = questions[i].answer;
  response = prompt(question);
  response = parseInt(response);
  if (response === answer) {
    correctAnswers += 1;
  } 
}

html = "You got " + correctAnswers + " question(s) right."
print(html);