JavaScript: Find the number of elements which presents in both of the given arrays

Last update on May 30 2022 10:07:51 (UTC/GMT +8 hours)

JavaScript Basic: Exercise-141 with Solution

Write a JavaScript program to find the number of elements which presents in both of the given arrays.

Pictorial Presentation:

JavaScript: Find the number of elements which presents in both of the given arrays.

Sample Solution:

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>Find the number of elements which presents in both of the given arrays.</title>
</head>
<body>

</body>
</html>

JavaScript Code:

function test_same_elements_both_arrays(arra1, arra2) {
  var result = 0;
  for(var i = 0; i < arra1.length; i++) {
    for(var j = 0; j < arra2.length; j++){
      if(arra1[i] === arra2[j])
      {
        result++;
      }
    }
  }
  return result;
}
console.log(test_same_elements_both_arrays([1,2,3,4], [1,2,3,4]));
console.log(test_same_elements_both_arrays([1,2,3,4], [1,2,3,5]));
console.log(test_same_elements_both_arrays([1,2,3,4], [11,22,33,44]));

Sample Output:

4
3
0

Flowchart:

ES6 Version:

function test_same_elements_both_arrays(arra1, arra2) {
  let result = 0;
  for(let i = 0; i < arra1.length; i++) {
    for(let j = 0; j < arra2.length; j++){
      if(arra1[i] === arra2[j])
      {
        result++;
      }
    }
  }
  return result;
}
console.log(test_same_elements_both_arrays([1,2,3,4], [1,2,3,4]));
console.log(test_same_elements_both_arrays([1,2,3,4], [1,2,3,5]));
console.log(test_same_elements_both_arrays([1,2,3,4], [11,22,33,44]));

Live Demo:

See the Pen javascript-basic-exercise-141 by w3resource (@w3resource) on CodePen.

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JavaScript: Tips of the Day

How to insert an item into an array at a specific index (JavaScript)?

What you want is the splice function on the native array object.

arr.splice(index, 0, item); will insert item into arr at the specified index (deleting 0 items first, that is, it's just an insert). In this example we will create an array and add an element to it into index 2:

var arr = []; arr[0] = "Jani"; arr[1] = "Hege"; arr[2] = "Stale"; arr[3] = "Kai Jim"; arr[4] = "Borge"; console.log(arr.join()); arr.splice(2, 0, "Lene"); console.log(arr.join());

Ref: https://bit.ly/2BXbp04