SOURCE

function dictionary(){
  this.datastore = new Array()
  this.add = add
  this.find = find
  this.remove = remove
  this.showAll = showAll
}
function add (key, value) {
  this.datastore[key] = value
}
function remove (key) {
  delete this.datastore[key]
}
function find (key) {
  return this.datastore[key]
}
function showAll () {
  for (var key in this.datastore){
    console.log(this.datastore[key])
  }
}
console.log(111)
var dic = new dictionary()
dic.add('name', 'cy')
dic.add('address', 'beijing')
dic.add('age', '24')
dic.showAll()
console.log('findName: ' + dic.find('name'))
dic.remove('name')
dic.showAll()