Random object in javascript

Question

I'm trying to write script that will show random question. I can't figure out how to do that.

This is my NOT WORKING ( = doesn't write anything on the element) code:

function theQ(quest, ans) { // question constructor
  this.question = quest;
  this.answer = ans;
}
var quest1 = new theQ("1+1", "2"); // object 1
var quest2 = new theQ("2+2", "4"); // object 2
var container = document.getElementById("rendomQuestion"); // display
var randomNumber = Math.random(); // randomize 
var numQuestion = Math.floor(randomNumber * theQ.length); // between theQ number of objects
container.innerHTML += quest+numQuestion.question; // write the chosen question.

Please tell me what am i doing wrong here..

Edit - this is my HTML:

<p id="rendomQuestion"></p>

Please define "not working"? What errors do you get? Post your HTML as well. We need a minimal reproducible example — j08691
– j08691, Commented Mar 27, 2017 at 21:12
That's a terrible duplicate there (it was stackoverflow.com/q/5117127/251311). Sorry community, but removing it, since it is entirely not relevant — zerkms
– zerkms, Commented Mar 27, 2017 at 21:16
@epascarello unless it's not what OP wants. OP does not need variable variables, but a help in choosing one value between the two. — zerkms
– zerkms, Commented Mar 27, 2017 at 21:23
Yep, and they do it because they don't know how to do it properly. — zerkms
– zerkms, Commented Mar 27, 2017 at 21:24
@epascarello top 5 answers there are irrelevant. I'm not sure a good duplicate would be something that requires you to check the least popular answer. Seriously, do you really think spreading document.write(eval(name)); is a good way to "choose one random value of two"? — zerkms
– zerkms, Commented Mar 27, 2017 at 21:26

trincot · Accepted Answer · 2017-03-27 21:18:20Z

2

You should use an array (of two questions):

function theQ(quest, ans) { // question constructor
  this.question = quest;
  this.answer = ans;
}
// *** Make it an array:
var quests = [new theQ("1+1", "2"),
              new theQ("2+2", "4")];
var container = document.getElementById("rendomQuestion");
var randomNumber = Math.random();
var numQuestion = Math.floor(randomNumber * theQ.length);
// *** Now use array notation:
container.textContent = quests[numQuestion].question;

<p id="rendomQuestion"></p>

edited Mar 27, 2017 at 21:18

answered Mar 27, 2017 at 21:14

trincot

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2 Comments

A. Meshu Over a year ago

work like a charm. i try to use object in order to check if the user answer correct. thank you.

A. Meshu Over a year ago

@trincot if you can have a look on this stackoverflow.com/questions/43086730/…

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