knock2.js

function* knockCodeHandler(preset) {
  while (true) {
    const input = [];
    for (let i=0; i<preset.length; i++) {
      input.push(getCode(yield));
    }
    if (input.join("") === preset) {
      success();    
    } else {
      failure();
    }
  }
}
element.onclick = coro(knockCodeHandler("0113"));