LRU Cache

gistfile1.txt

class Cache {
	constructor() {
  	this.theCache = {}
  }
	setImageById(id, image) {
  	let numberOfImages = Object.keys(this.cache).length
    if (numberOfImages > 50) {
    	let keyOfOldest;
    	for(key in this.theCache) {
      	if (!keyOfOldest) {
        	keyOfOldest = key
        } else {
        	if (this.cache[keyOfOldest].date > this.theCache[key].date) {
          	keyOfOldest = key
          }
        }
      }
      this.theCache.remove(keyOfOldest)
    }
    this.theCache[id] = {image, date: Date.now}
  }
  
  getImageById(id) {
  	this.theCache[id].date = Date.now
  	return this.theCache[id].image
  }
}