JS Mem Heap

addArray.js

let array = [];

// This function adds an object to the array, but the object has a reference
// to the array itself, creating a circular reference.
function addToArray() {
  let obj = {};
  obj.array = array;
  array.push(obj);
}

// If this function is called repeatedly, it will create more and more objects
// that are added to the array, but they will never be garbage collected because
// they have a reference to the array, and the array has a reference to them.
// This will cause the heap to fill up with unused objects and eventually cause
// a memory leak.
addToArray();