encodeAndDecodeMessages

function encodeAndDecodeMessages() {
    let inputText = document.getElementsByTagName('textarea')[0];
    let receiverArea = document.getElementsByTagName('textarea')[1];

    let encodeButton = document.getElementsByTagName('button')[0];
    let decodeButton = document.getElementsByTagName('button')[1];

    encodeButton.addEventListener('click', () => {
        let newText = '';
        for (let character of inputText.value) {
            //console.log(character.charCodeAt(0));
            newText += String.fromCharCode((character.charCodeAt(0) + 1));
        }
        receiverArea.value = newText;
        document.getElementsByTagName('textarea')[0].value = '';
    })

    decodeButton.addEventListener('click', () => {
        let newText = '';
        for (let character of receiverArea.value) {
            //console.log(character.charCodeAt(0));
            newText += String.fromCharCode((character.charCodeAt(0) - 1));
        }
        receiverArea.value = newText;
        //document.getElementsByTagName('textarea')[0].value = '';
    })
}