JAVASCRIPT

for htmlcollection javascript

var list = document.getElementsByClassName("class-name");
for (let item of list) {
    console.log(item.id);
}

javascript htmlcollection

/* 
	Every function like document.getElementById() is a function of 
    htmlcollection. You can also change it or add new functions to it.
*/
// Examples 
HTMLCollection.namedItem()
HTMLCollection.item()
HTMLCollection.length
// How To Extend
HTMLCollection.prototype.class = function (value) {

};
document.getElementById("main").class();