Function findMin

src/math/calculation.js:700–706

   */
  fn.min = function(...args) {
    const findMin = arr => {
      let min = Infinity;
      for (let x of arr) {
        min = Math.min(min, x);
      }
      return min;
    };

    if (args[0] instanceof Array) {
      return findMin(args[0]);