How to get index in forEach?

Question

I'm inheriting some code from someone else but I never used this way. I used to use

for(var i = 0; i<items.length; ++i; {
   items[i];

Or

myArray.forEach(function (value, i) {
          items[i];

But what if I use the following?

filtererdData.forEach(regionData => {
   index?

Answer 1

Something like this.

filteredData.forEach((regionData, index) => {
  // your code here
})

Ref forEach: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/forEach