How to read line by line of a text area HTML tag

Question

I have a text area where each line contains Integer value like follows

      1234
      4321
     123445

I want to check if the user has re

Answer 1

This works without needing jQuery:

var textArea = document.getElementById("my-text-area");
var arrayOfLines = textArea.value.split("\n"); // arrayOfLines is array where every element is string of one line