How to get the common values in an array

Question

For example i am having an array of data as below

var arrData = ["40-25",null,null,"40-25","50-48",null,"30-25","40-23","50-48","30-25",null,"50-48","40-45","40-45","40-45","40-50","40-50",null,null,null,null,null,"50-48"]

i need to list the same data as below in javascript

var arrDataSorted = ["40-25","50-48","30-25","40-23","40-45","40-50","40-50"]

need only the common data that replicates also the null to be removed.

What is the best solution to solve this.

Answer 1

You can try using Array.prototype.filter() to remove null values and Set to get the unique values. Finally use the Spread syntax (...) to transform the set result into an array.

Try the following way:

var arrData = ["40-25",null,null,"40-25","50-48",null,"30-25","40-23","50-48","30-25",null,"50-48","40-45","40-45","40-45","40-50","40-50",null,null,null,null,null,"50-48"];

var arrDataSorted = [...new Set(arrData.filter(i => i))];
console.log(arrDataSorted);