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class Collection {
    constructor(set) {
        if (!['Set', 'Array'].includes(set.constructor.name)) {
            throw new Error("Conllection 的构造函数只接收Set和Array对象")
        }
        this._entries = Array.from(set)
        this._index = -1
    }
    [Symbol.iterator]() {
        let that = this

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	attributeChangedCallback(attr, oldValue, newValue) {
		super.attributeChangedCallback(attr, oldValue, newValue)
		if (!this.watch || !this.watch.apply) {
			return null
		}
		if (!this._watch) {
			this._watch = this.watch()
		}
		if (this._watch.hasOwnProperty(attr)) {
			const watcher = this._watch[attr]

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# ~/.bashrc: executed by bash(1) for non-login shells.
# see /usr/share/doc/bash/examples/startup-files (in the package bash-doc)
# for examples

# If not running interactively, don't do anything
case $- in
    *i*) ;;
      *) return;;
esac

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/*
And connect with a tcp client from the command line using netcat, the *nix 
utility for reading and writing across tcp/udp network connections. 
$ netcat 127.0.0.1 1337
You should see:
> Echo server
*/

/* Or use this example tcp client written in node.js.  (Originated with 

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/**
 * subscriptions data format: 
 * { eventType: { id: callback } }
 */
const subscriptions = { }
const getNextUniqueId = getIdGenerator()

function subscribe(eventType, callback) {
    const id = getNextUniqueId()

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/*!
Math.uuid.js (v1.4)
http://www.broofa.com
mailto:robert@broofa.com

Copyright (c) 2010 Robert Kieffer
Dual licensed under the MIT and GPL licenses.
*/

/*