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welcome to this video in this video we're going to have a look at how we can merge the result the values of two observables in q1 using the merge map operator as always you can find the source code starting and ending source code for this video in a link in the video description and with that let's get started and let's find out how merge map actually works in the starting project I have a little bit of code with two inputs and a combined value paragraph but obviously nothing is happening here now I want to change that and I want to change it using observables so what can I do well for a start I want to react to whenever I type something into these input fields so I need access to them so let's use good old JavaScript to get access using query selector and then you can see that these inputs have some ID so I can use the input one idea let me bring this into a new line input 1 ID for the first input and then simply copy that for the second one to also replace it here and now get access to both inputs why because as I said I want to react to an event here to the input event so that would be the next step I can create an observable and using rx which I already do import observable from event I can react to events on that or on any element so I could pass input 1 this element here and react to the input event which is fired whenever the user types now doing that what I can do is I can subscribe to that of course and then the first callback or the first function which I passed to subscribe I know that I will get the event because they are using from event to constructors observable and I can use that event data to basically simply set MDD of the value of my Spanier which I also need to fetch because they are going to output my values so span using document query selector and other span element set it to whatever I typed so I could simply say span text content equals events targets that will be the input which fire the event so where the user disk type something and then target value to get the value of that input if we hit enter and we type something into the first input here you see that we log it here in our combined value field however it's not really a combined value of course because the second input doesn't do anything now clearly we can also create a second observable so let me quickly do that here ops to where I listen to you the same event on the input queue and now if I hit control later I can type something here and I update the span and I can't...