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app.coffee -------------------------------------------
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{VariableTestLayer} = require "VariableTestLayer"
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myVarLayer = new VariableTestLayer
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myVarLayer.myVar = "external value"
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	myVar: "external value"
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VariableTestLayer.coffee -----------------------------
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class exports.VariableTestLayer extends Layer
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	constructor: (@options={}) ->
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		myVar = if @options.myVar? then @options.myVar else "internal value only"
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		@options.myVar ?= "internal value"
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		print myVar
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		super @options
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		print @options.myVar