How to generate random numbers in Javascript

Question

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Generating random numbers in Javascript

Hi..

I want to generate random numbers (integers) in javascript within a specified range. ie. 101-999. How can I do that. Does Math.random() function supports range parameters ?

possible duplicate of [Generating random numbers in Javascript](http://stackoverflow.com/questions/1527803/generating-random-numbers-in-javascript) It covers exactly your question. — Felix Kling, Nov 16 '10 at 13:34

score 8 · Answer 1 · answered Nov 16 '10 at 13:34

8

Just scale the result:

function randomInRange(from, to) {
  var r = Math.random();
  return Math.floor(r * (to - from) + from);
}

answered Nov 16 '10 at 13:34

Pointy

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Great...Works pretty well...Thanks :) – Vineet Sharma Nov 16 '10 at 13:42

score 7 · Accepted Answer · answered Nov 16 '10 at 13:37

7

The function below takes a min and max value (your range).

function randomXToY(minVal,maxVal)
{
  var randVal = minVal+(Math.random()*(maxVal-minVal));
  return Math.round(randVal);
}

Use:

var random = randomXToY(101, 999);

Hope this helps.

answered Nov 16 '10 at 13:37

Evan Mulawski

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score 1 · Answer 3 · edited Nov 16 '10 at 13:39

1

Math.floor(Math.random()*898)+101

edited Nov 16 '10 at 13:39

Andy E

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answered Nov 16 '10 at 13:34

SK-logic

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How to generate random numbers in Javascript

3 Answers3