I want to split an array and splice it based on some pattern inside the array

Hello I couldn’t figure out how to do this,

Let’s say I have an array like this

main = [ "1","2","A","4","5","B","6","7","A","8","9","B","10"];

I want to get a new array with result

main2 = ["A","4","5","B","A","8","9","B"] 

and finally break them apart like the following;

main3 = ["A","4","5","B"]     
main4 = ["A","8","9","B"]

As you can see I am taking out the array items from A-B that happened twice.

>Solution :

Here’s the old-school approach.

const main = ["1", "2", "A", "4", "5", "B", "6", "7", "A", "8", "9", "B", "10"];
const start = "A";
const end = "B";
let result = [];
let isCollecting = false;

main.forEach(item => {
  if (item === start) isCollecting = true;

  if (isCollecting) result.push(item);

  if (item === end) {
    console.log(result);
    result = [];
    isCollecting = false;
  }
});