code: function Node(key, value) {
    this.key = key;
    this.value = value;
    this.degree = 0;
    this.parent = undefined;
    this.child = undefined;
    this.sibling = undefined;
  }
docs: Creates a Binomial Heap node.
  
  @constructor
  @param {Object} key The key of the new node.
  @param {Object} value The value of the new node.