JavaScript for Loop - Error Code "item not defined"

I am a bit stuck here because I can't figure out why this does not work. When i try to run the code then it says "ReferenceError: item is not defined" - but I thought that by writing "let item" I am defining it. Any idea what the problem is here ?

• i know the code looks a bit more complicated than necessary but i need to do it like that.

class Graph {
  constructor() {
    this.nodes = new Set();
    this.edges = new Set();
  }

  add(m,n){
   let e = new Edge (m,n)
   var allEdges = new Set();
   for (let item of this.edges){ 
     allEdges.add(item.startpoint.nodeName,item.endpoint.nodeName)
   };
   if (allEdges.has(e.startpoint.nodeName,e.endpoint.nodeName)){ 
     console.log("first OCL Constraint")
   } else if(allEdges.has(e.endpoint.nodeName,e.startpoint.nodeName){    
     console.log("second OCL Constraint")}
   else { 
     this.edges.add(item.startpoint.nodeName,item.endpoint.nodeName)};
   }
};

class Edge {
  constructor(startpoint,endpoint) {
    this.startpoint = startpoint;
    this.endpoint = endpoint;
  }
};

class Node {
  constructor(nodeName) {
    this.nodeName = nodeName
  }
};

node1 = new Node (1);
node2 = new Node (2);
node3 = new Node (3);
node4 = new Node (4);
node5 = new Node (5);
myTestGraph = new Graph();

myTestGraph.add(node1,node2);
myTestGraph.add(node2,node1);
myTestGraph.add(node3,node4);

Thanks in advance :)

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