[Hackerrank] Solution of Encryption Shop in JavaScript - nguyenhungkhanh.com

hackerrank_solution_of_encryption_in_javascript.js

// Complete the encryption function below.
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(' ');
}