const textInput = document.getElementById("textInput"); const processButton = document.getElementById("processButton"); var inputText = "NaN" var lines = "NaN" var modifiedArr = "NaN" processButton.addEventListener("click", function () { inputText = textInput.value; lines = inputText.split(/[\n\r]+/); console.log(lines); modifiedArr = lines.map(i => ' "' + i + '"'); console.log(modifiedArr) }); function addArrayToTextarea() { const textarea = document.getElementById("myTextarea"); textarea.value = modifiedArr }