Get Random Numbers in JavaScript

February 2014

Funcations to get random Integers and Floats. Both work with negative numbers.

Integer: min >= RESULT <= max

JavaScript

function randomInt(min, max) {
  return Math.floor(Math.random() * (max - min + 1)) + min;
}

Output:

min: 0 ~ max: 5 ~ possible results:

0, 1, 2, 3, 4, 5

min: -5 ~ max: 0 ~ possible results:

-5, -4, -3, -2, -1, 0

JavaScript

function randomFloat(min, max) {
  return (Math.random() * (max - min)) + min;
}

Output:

min: 0 ~ max: 5 ~ possible results:

0.0 to 4.999999.... - for example:

min: -5 ~ max: 0 ~ possible results:

-5.0 to 0.000...001

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Math.random()