Set Method

The simplest and most efficient way to remove duplicates from an array is using Set. A Set is a built-in function in a JavaScript object that stores unique values.

const setArray = new Set([1001,1020,1400,2300,1002]);
// Array.from Method

const Uniquevalue= Array.from(new Set(setArray));

// Spread Method
const Uniquevalue = [... new Set(setArray)];

console.log(Uniquevalue);

Output:

[1001, 1020, 1400, 2300, 1002]

Filter() Method

Using Filter with the ‘IndexOf’ array method, we can remove duplicates from the array object.

const Uniquevalue = [1001,1020,1400,2300,1002,6500,5001,4001,5001];
 
console.log('Filter Method'); 
const uniqueEmpcode = Uniquevalue.filter((value,index,items)=> items.indexOf(value)===index);
console.log(Uniquevalue);

Output:

[1001, 1020, 1400, 2300, 1002, 6500, 5001, 4001] 

reduce() Method

With the ‘reduce()’ method we can also remove the duplicate elements in the array.

console.log('Reduce Method');
const Uniquevalue = [1001,1020,1400,2300,1002,6500,5001,4001,5001];
 
const uniqueEmpcodereduce = Uniquevalue.reduce(
    (value,items)=> value.includes(items) ? value : [...value,items],       
    []);
console.log(uniqueEmpcodereduce);

Here is the Output:

[1001, 1020, 1400, 2300, 1002, 6500, 5001, 4001] 

More Article – Convert Set into an Array in TypeScript

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Remove Duplicate Element in Array C#

As previously indicated, C# doesn’t have a built-in function for removing duplicate values from an array. We can instead build a new array with separate values. Getting unique values refers to the process of constructing a new array containing separate values.

The following example uses the Distinct() function to extract distinct values from an array and then builds a new array.

Remove Duplicate in an integer array

  public static int[] removeduplicatearray()
        {
            int[] arraynum = { 2, 5, 4, 3, 2, 7 };
            int[] distinctarray = arraynum.Distinct().ToArray();

            return distinctarray;
        }

We have an integer array arraynum with six members in the above code, and we want to delete the duplicates. We use the Distinct() function to create a new array that only contains the original array’s distinct members. Finally, we transform the output into an array and assign it to the original array.

Remove Duplicate in a string array

  public static string[] removeduplicatearraystring()
        {
            string[] arraystr = { "Apple", "Samsung", "Honor", "Redmi", "Apple" };
            string[] distinctarraystring = arraystr.Distinct().ToArray();

            return distinctarraystring;
        }

Try it

We have an integer array arraystr with five members in the above code, and we want to delete the duplicates. We use the Distinct() function to create a new array that only contains the original array’s distinct members. Finally, we transform the output into an array and assign it to the original array.

More Related Post: Remove Elements from an Array in C#

Conclusion

In this article, we explored How to Remove Duplicates from an Array in c#. We learned that we can achieve the same result by creating a new array with distinct values

The post How to Remove Duplicates from an Array in C# appeared first on Tech Insights.