JSFiddle - React, Tailwind, and code Playground

by Jessie Lau

JavaScript

function getMissingElement(superImportantArray){
  var sorted = superImportantArray.sort(function(a,b){return a-b});
    console.log(sorted);
    for(var i = 0; i<= sorted.length; i++){
      if(sorted[i]+1 != sorted[i+1]){
        return sorted[i]+1;
      }
      if(sorted[i]+1 == 9){
              return 0;
      }
    }
}
console.log(getMissingElement([ 1, 2, 3, 4, 5, 6, 7, 8, 9 ]));