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

The post How to remove duplicates from an Array in TypeScript appeared first on Tech Insights.