@woosh/meep-engine/src/core/math/random/randomIntegerBetween.js

Pure JavaScript game engine. Fully featured and production ready.

import { assert } from "../../assert.js";

/**
 * Inclusive random between two boundaries, result is integer
 * @param {function} random
 * @param {number} min lower boundary, must be an integer
 * @param {number} max upper boundary, must be an integer
 * @returns {number}
 */
export function randomIntegerBetween(random, min, max) {
    assert.isInteger(min, 'min');
    assert.isInteger(max, 'max');

    const span = max - min;

    const roll = random();

    assert.greaterThanOrEqual(roll, 0, 'random should return value between 0 and 1');
    assert.lessThanOrEqual(roll, 1, 'random should return value between 0 and 1');

    return Math.round(roll * span) + min;
}