in Output/Gemini1_0/JS/extracted_code/translation/VanillaToAngular_high_low/app.component.ts [62:72]
change(type: string) {
document.querySelector('.btn-active')?.classList.remove('btn-active');
const btn = document.querySelector(`.btn-${type}`);
btn?.classList.add('btn-active');
const piano = document.querySelector('.piano');
if (type === 'letters') {
piano?.classList.add('letters');
} else {
piano?.classList.remove('letters');
}
}