collection.js

export class Collection {

  constructor(items = { }) {
    this.data = { }
    this.replace(items)
  }

  set(key, value) {
    this.data[ key ] = value
  }

  replace(items) {
    for (let key in items) {
      this.set(key, items[key])
    }
  }

  has(key) {
    return this.data.hasOwnProperty(key)
  }

  get(key, or = null) {
    return this.has(key) ? this.data[ key ] : or
  }

  all() {
    return this.data
  }

  keys() {
    return Object.keys(this.all())
  }

  remove(key) {
    delete this.data[ key ]
  }

  clear() {
    this.data = { }
  }

  count() {
    return this.keys().length
  }

}