Ways to programmatically compare all elements between two separate arrays

Is there a way to create a process where the first loop iterates through the elements of one array, while another loop goes through a second array and compares each element in the first array with all elements in the second array?

For example: //first loop iterating through array1

for (var i = 0; i < array1.length; i++) {

        //storing the current element
        var test = array1[i]

       //second loop iterating through array2
       for (var j = 0; j < array2.length; j++) {
          //comparing the current element from array1 to all elements in array2
          if (test == array2[j]) {
            alert(array2[j])
          }
        }
      }

Essentially, I am looking to have the first loop compare each element of array1 to every element in array2 before moving on to the next element in array1. However, when I run this code, it seems to only keep alerting the first element of array 1 repeatedly.

Answer №1

To detect the shared elements in two arrays and display an alert, follow this method.

  const arrayOne = [16, 26, 41];
  const arrayTwo = [10, 12, 26];

  for (const element of arrayOne) {
    if (arrayTwo.includes(element)) {
      alert(element);
    }
  }

https://i.sstatic.net/uo6H4.png

Answer №2

There is just one error in your code. Because my reputation is not 50, I am unable to provide a comment at this time. Make sure to use j++ instead of i++ in the second loop.

No need for a test variable when comparing.

for (var i = 0; i < array1.length; i++) {
  for (var j = 0; j < array2.length; j++) {
    if (array1[i] == array2[j]) {
      alert(array2[j]);
    }
  }
}

In the future, please ensure that your questions are clearly stated. Thank you!

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