Turing Coding Challenge Practise Test - Problem 2

gistfile1.txt

// console.log("Hello, World!");
var countElements = function(arr) {
  var result = 0;
  // output = 0;
  
  // count elements
  for (var i = 0; i < arr.length; i++) {
    if(arr.includes(arr[i] + 1)) {
      result+= 1
    }
  }
  return result;
}

var arr = '1 1 2'.split(" ").map(num => parseInt(num));

console.log(countElements(arr));

Instead of such long logic, we can also use Set like

var countElements = function(arr) {
return new Set(arr).size;
}

var arr = '1 1 2 2 9 8'.split(" ").map(num => parseInt(num));

console.log(countElements(arr));

Much thanks bro, I'm glad to learn!