Example 1: Using concat() and for Loop
// program to merge and remove duplicate value from an array
function getUniqueAfterMerge(arr1, arr2){
// merge two arrays
let arr = arr1.concat(arr2);
let uniqueArr = [];
// loop through array
for(let i of arr) {
if(uniqueArr.indexOf(i) === -1) {
uniqueArr.push(i);
}
}
console.log(uniqueArr);
}
const array1 = [1, 2, 3];
const array2 = [2, 3, 5]
// calling the function
// passing array argument
getUniqueAfterMerge(array1, array2);
Output
[1, 2, 3, 5]
In the above program, the two array elements are merged together and the duplicate elements are removed.
Here,
- The two arrays are merged using the
concat()
method. - The
for...of
loop is used to loop through all the elements of arr. - The
indexOf()
method returns -1 if the element is not in the array.
Hence, during each iteration, if the element equals -1, the element is added to theĀ uniqueArr array using the push()
method.
Example 2: Using Spread Syntax and Set
// program to merge and remove duplicate value from an array
function getUniqueAfterMerge(arr1, arr2){
// merge two arrays
let arr = [...arr1, ...arr2];
// removing duplicate
let uniqueArr = [...new Set(arr)];
console.log(uniqueArr);
}
const array1 = [1, 2, 3];
const array2 = [2, 3, 5]
// calling the function
getUniqueAfterMerge(array1, array2);
Output
[1, 2, 3, 5]
In the above program, two arrays are merged together and Set
is used to remove duplicate items from an array.
The Set
is a collection of unique values.
Here,
- Two array elements are merged together using the spread syntax
...
- The array is converted to
Set
and all the duplicate elements are automatically removed. - The spread syntax
...
is then used to include all the elements of the set back to an array.