How to Generate Random Numbers Within a Specific Range in JavaScript?

Generating a Random Number between a Specified Range in JavaScript

Generating random numbers in JavaScript is a common task, especially when developing games or performing simulations. A specific challenge is generating random numbers within a given range.

To achieve this, JavaScript provides a simple yet effective technique:

function randomIntFromInterval(min, max) {
  // min and max included 
  return Math.floor(Math.random() * (max - min + 1) + min);
}

This function takes two parameters, min and max, representing the desired range. It employs the Math.random() function to generate a random float number between 0 and 1. Then, it multiplies this number by the range size (max - min 1) and adds the minimum value (min). Finally, it truncates the result with Math.floor() to obtain a random integer within the specified range.

For example, consider the following code snippet:

const rndInt = randomIntFromInterval(1, 6);
console.log(rndInt);

This code snippet generates a random integer between 1 and 6, inclusive. The returned value can be any number from 1 to 6, with equal probability, as shown by the following output:

3

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