module.exports = {
  min(...nums) {
    if (nums.length === 0) {
      throw new Error('invalid arguments');
    }
    return nums.reduce((a, b) => (a < b ? a : b));
  },
  max(...nums) {
    if (nums.length === 0) {
      throw new Error('invalid arguments');
    }
    return nums.reduce((a, b) => (a > b ? a : b));
  },
  abs(num) {
    if (num < 0n) {
      return num * -1n;
    }
    return num;
  },
  sqrt(num) {
    if (num < 0n) {
      throw new Error('no sqrt of negative');
    }
    if (num <= 1n) {
      return num;
    }

    let x0 = num >> 1n;
    let x1 = (x0 + num / x0) >> 1n;

    while (x1 < x0) {
      x0 = x1;
      x1 = (x0 + num / x0) >> 1n;
    }

    return x0;
  },
  // todo: implement longer string parsing, should be simple-ish to do with
  //   some looping and multiplication
  parseInt(string, radix) {
    if (string.length > 10) {
      console.log(string);
      throw new Error('todo');
    }
    return BigInt(parseInt(string, radix));
  },
};