encryption

Rahman Niftaliyev

The encryption function takes a string and creates an encrypted string by using a cryptographic algorithm. The ceil function rounds down the length of the string to an integer. The substring function takes the first n characters of the string, converts them to a number and returns it. The reduce function takes two arguments: an iterator and a function that takes two values and returns a single value. The function returns the value of r + (v[i] || ""). The function calls the array.reduce() function with the value of r and the value of v[i] as arguments.

function encryption(s) {
  const ceil = Math.ceil(Math.sqrt(s.length));

  let temp = s;
  let array = [];

  while (temp) {
    array = array.concat(temp.substring(0, ceil));
    temp = temp.substring(ceil);
  }

  let result = [];

  for (let i = 0; i < ceil; i++) {
    result = result.concat(
      array.reduce((r, v) => {
        return r + (v[i] || "");
      }, "")
    );
  }
  return result.join(" ");
}