/** * Gets a random number between 2 bigInts * @param {BigInt} max * @param {BigInt} [min=0n] * @returns {BigInt} */ function randomBetween(max, min = 0n) { max = BigInt(max); min = BigInt(min); if (max < min) { [max, min] = [min, max] } const range = max - min; const count = calculatePrecision(range); let random = new Array(Number(count)) .fill(0) .map(() => BigInt(Math.floor(Math.random() * (2 ** 32)))) .map((int, index) => int << (BigInt(index) * 32n)) .reduce((acc, int) => acc + int, 0n); let bitCount = countBits(range); let minRandom = random >> ((32n * count) - bitCount); if (minRandom > range) return randomBetween(max, min); else return minRandom + min; } function calculatePrecision(range) { const result = range >> 32n; if (result >= 1n) { return calculatePrecision(result) + 1n; } return 1n; } function countBits(range) { const result = range >> 1n; if (result >= 1n) { return countBits(result) + 1n; } return 1n; } const a = randomBetween(10n ** 20n, 10n ** 19n) const b = randomBetween(10n ** 20n, 10n ** 19n) aBigInt = a; bBigInt = b; aString = a.toString(); bString = b.toString(); aFloat = Number(a); bFloat = Number(b);