Create a simple store for DOM element

Question

We have Map in es6, so we could use any data as key, such as DOM element.

const map = new Map()
map.set(domNode, somedata)

What if we need to support old JavaScript env like es5, how would you create your own Node Store as above?

You are asked to implement a Node Store, which supports DOM element as key.

class NodeStore {

  set(node, value) {

  }
  
  get(node) {

  }
  
  has(node) {

  }
}

note

Map is disabled when judging your code, it is against the goal of practicing.

You can create a simple general Map polyfill. Or since you are asked to support specially for DOM element, what is special about DOM element?

What is the Time / Space cost of your solution?

Code

class NodeStore {
   /**
   * @param {Node} node
   * @param {any} value
   */
  set(node, value) {
   
  }
  /**
   * @param {Node} node
   * @return {any}
   */
  get(node) {
   
  }
  
  /**
   * @param {Node} node
   * @return {Boolean}
   */
  has(node) {
    
  }
}

Source

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