advent-of-code/script.js

const ASSIGNMENT = 'assignment';
const ANSWER = 'answer';
const NEWLINE_CHARACTER = '\n';

/**
 * Main function
 */
window.onload = function() {
    document.getElementById(ASSIGNMENT).addEventListener("input", calculateAnswer);
}

/**
 * Listener function for input in assignment field.
 * @param event the onInput event 
 */
function calculateAnswer(event) {
  console.info("Calculating answer for input...");
  let answer = algorithm(event.target.value);

  document.getElementById(ANSWER).innerText = answer;
}

/**
 * Calculate the answer to assignment.
 * @param assignment the input from the assignment.
 * @return string the answer
 */
function algorithm(assignment) {
    let lines = assignment.trim().split(NEWLINE_CHARACTER);
    console.info("Linecount:" + lines.length);

    // TODO: implement assignment
}