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okay this is a video about the command design pattern this is my second video on the command design pattern and this oneamp;#39;s gonna be slightly more advanced so here we go down here Iamp;#39;ve got a slider like a slider on a heater and what it will do the slider is called the invoker and it invokes a command any of these commands down here and they all implemented the I command interface and that executes on the receiver which is the heater and there are three functions here sit to max it 2% and turn off and these are the commands that are invoked now thatamp;#39;s the first part of this video the second part I will add a another interface called the I undo/redo interface and the slider will implement the I undo youamp;#39;ll have it three extra functions history undo redo and thatamp;#39;s weamp;#39;ve got down here history well thatamp;#39;s a property redo and undo so that whenever the whenever this slider is invoked whenever the client application invokes the slider it
