In this article, we will learn how to find every element that exists in any of the given two arrays. To find every element that exists in any of two given arrays, you can merge the arrays and remove any duplicate elements.
Method 1: Using Set
A set is a collection of unique items i.e. no element can be repeated. We will add all elements of two arrays to the set, and then we will return the set.
Example: In this example, we will see the use of the Javascript set method to find every element that exists in any of the two given arrays once.
Javascript
// Function which takes an array as argument    const print = (arr1,arr2) => {             // Creating a set with elements of arr1        const set = new Set(arr1)             // Adding elements of arr2        arr2.forEach(element => {            set.add(element)        });             // Returning resultant array        return set    }         // Input array    const arr1 = [10, 20, 30, 40, 50]    const arr2 = [10,20,34,32,11]          // Printing the result    console.log(print(arr1,arr2)) |
Set(8) { 10, 20, 30, 40, 50, 34, 32, 11 }
Method 2: Using loop
In this approach, we will choose one array and then we will run a loop on the second array and check whether an element of this array is present in the first array or not. If an element is already present, we skip otherwise we will add this to the first array.
Example: In this example, we will see the use of Javascript loops to find every element that exists in any of the two given arrays once.
Javascript
// Javascript program to find all element// present in any of two given arraysÂ
// Function which takes an array as argumentconst print = (arr, arr2) => {Â
    // A counter for adding element    let k = arr.lengthÂ
    // Checking every element and    // adding required element    arr2.forEach(element => {        if (arr.indexOf(element) == -1) {            arr[k] = element            k++        }    });Â
    // Returning resultant array    return arr}Â
// Input arrayconst arr1 = [1, 2, 3, 4, 5]const arr2 = [1, 2, 3, 4]Â
// Printing the resultconsole.log(print(arr1, arr2)) |
[ 1, 2, 3, 4, 5 ]
Method 3: Using filter() and concat()
In this method, we will use the concat() method to merge the array and filter() method for removing the element which repeats.
Example:
Javascript
function findElementsInArr(arr1, arr2) {Â Â Â Â let mergedArray = arr1.concat(arr2);Â Â Â Â let uniqueEle = mergedArray.filter(function (element, index, self) {Â Â Â Â Â Â Â Â return self.indexOf(element) === index;Â Â Â Â });Â Â Â Â return uniqueEle;}Â
let arr1 = [1, 2, 3, 4];let arr2 = [3, 4, 5, 6];let result = findElementsInArr(arr1, arr2);console.log(result); |
[ 1, 2, 3, 4, 5, 6 ]
