Constructor Error

Question

When I run this JS I get TypeError, here is the source code:
var cur, render;
class node { //NODE CONSTRUCTOR
constructor(x){
this.elem = x;
this.next = null;
}
}
class llist {
constructor(){ //LINKED LIST CONSTRUCTOR
this.head = null;
this.size = 0;
this.push = addElement;
}
}
function addElement(y){ //PUSH FUNCTION
var node = new node(y);
if (this.head == null)
this.head = node;
else{
cur = this.head;
while (cur.next!=null)
cur = cur.next;
cur.next = node;
}
this.size++;
}
var myList = new llist();
myList.push("hello");
myList.push("world");
render = myList.head; //support variable for printing out the liked list
for (let i=0; i<myList.size; i++){
document.write(render+" ");
render = render.next;
}
Here is the TypeError: "Uncaught TypeError: node is not a constructor at llist.push"
Why "var node = new node(y);" shouldn't be working as a constructor?

Answer 1

You had a naming collision. node the variable and node the class.

Answer 2

Figured out that replacing "node" with "Node" makes it working...but why? I haven't seen "node" among keywords in JS.