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Generating random numbers in Javascript in a specific range?
Say I wanted to generate a random number from 50 to 100.
I know there's:
Math.random()
but I could only find ways to go from 1 to 'x'
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Do you know how to translate an integer interval? – John Dvorak Dec 21 '12 at 22:08
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If you know how to go from 1 to x why not just make x = 51 and add 49? – Martin Smith Dec 21 '12 at 22:09
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1Dup: http://stackoverflow.com/questions/1527803/generating-random-numbers-in-javascript-in-a-specific-range – anson Dec 21 '12 at 22:11
2 Answers
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From MDN on Math.random():
// Returns a random integer between min and max
// Using Math.round() will give you a non-uniform distribution!
function getRandomInt(min, max) {
return Math.floor(Math.random() * (max - min + 1)) + min;
}
Sirko
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I believe this would also work:
function randomInt(min,range) {
return Math.floor((Math.random()*(range+1))+min)
}
In your case min would be 50 and range would be 50
simonthumper
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Due to the `Math.floor()` and the random interval `[0,1)` this can never yield `100` so you need `(Math.random()*(min+1))`. Also this formula only is working because `min == range` here, they need to be switched. – Christoph Dec 22 '12 at 09:13
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