JAVASCRIPT

JS toggle

document.querySelector('.show-more').addEventListener('click', function () {
  document.querySelector('.additional-information')
    .classList.toggle('is-visible');
});

toggle function in javascript

let flag = false;

const toggle = () => {
	if ( flag ) {
     // insert code here when flag is on/true
    } else {
    // insert code here when flag is off/false
    }
    flag = ! flag;
}