DynVal.js
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DynVal.js
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	/**
	* @provides javelin-dynval
	* @requires javelin-install
	* javelin-reactornode
	* javelin-util
	* javelin-reactor
	* @javelin
	*/

	JX.install('DynVal', {
	members : {
	_lastPulseVal : null,
	_reactorNode : null,
	getValueNow : function() {
	return this._lastPulseVal;
	},
	getChanges : function() {
	return this._reactorNode;
	},
	forceValueNow : function(value) {
	this.getChanges().forceSendValue(value);
	},
	transform : function(fn) {
	return new JX.DynVal(
	this.getChanges().transform(fn),
	fn(this.getValueNow())
	);
	},
	calm : function(min_interval) {
	return new JX.DynVal(
	this.getChanges().calm(min_interval),
	this.getValueNow()
	);
	}
	},
	construct : function(stream, init) {
	this._lastPulseVal = init;
	this._reactorNode =
	new JX.ReactorNode([stream], JX.bind(this, function(pulse) {
	if (this._lastPulseVal == pulse) {
	return JX.Reactor.DoNotPropagate;
	}
	this._lastPulseVal = pulse;
	return pulse;
	}));
	}
	});