random.js

// Copyright (c) Microsoft Corporation.
// Licensed under the MIT license.
/**
 * Returns a random integer value between a lower and upper bound,
 * inclusive of both bounds.
 * Note that this uses Math.random and isn't secure. If you need to use
 * this for any kind of security purpose, find a better source of random.
 * @param min - The smallest integer value allowed.
 * @param max - The largest integer value allowed.
 */
export function getRandomIntegerInclusive(min, max) {
    // Make sure inputs are integers.
    min = Math.ceil(min);
    max = Math.floor(max);
    // Pick a random offset from zero to the size of the range.
    // Since Math.random() can never return 1, we have to make the range one larger
    // in order to be inclusive of the maximum value after we take the floor.
    const offset = Math.floor(Math.random() * (max - min + 1));
    return offset + min;
}
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