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Using the map method with Observable

Using the map method with Observable

3:45
Like an array, Observable has a map method that allows us to transform a sequence into a new Observable.
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egghead.io

Like an array, Observable has a map method that allows us to transform a sequence into a new Observable.

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Dougal

Super excited to see all these new tutorials

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Jafar

Just wait. Soon we're going to get into the really fun stuff!

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Mark

Really great series - I'm learning a terrific amount. I've known about filters/maps etc but never really quite understood their true value.

On thing tho, in the video above you comment out code to show that observables are lazy. But you comment out the alert too so of course nothing happens - lazy or not.... Took me a while to realise what I was supposed to (not) see :)

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Jafar

Thanks for pointing that out. Sorry about that.

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Ian Poston

Hi Jafar. Nice lesson so far. I was wondering how does onCompleted get called. What purpose does onCompleted have?

In reply to Jafar
HEY, QUICK QUESTION!
Joel's Head
Why are we asking?