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Hey everybody, I'm Pete.

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So, who is exited for some big O-notation in the morning?

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Alright, alright, so we gonna get to that.

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but before we do

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i'm just gonna say I'm Pete.

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I work at Facebook on the Instagram team


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and I'm a contribute to a library called react

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which you may have heard is the one that puts the 
angle brackets in your javascript

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.. but, I'm not gonna really talk to much of that 
React and why it is so awesome because

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that's not the interesting part

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what I wanna talk about the ideas behind React

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and React is a reference implementation of those ideas.

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So. This isn't a turial

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and I give a focus on ideas and not implementations.

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So. I'm gonna talk about the ideas behind react

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Some ideas behind other systems

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how they're a different kind a

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what a different tradeoffs are in there 
are different tradeoffs between them

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and hopefully you take some of the ideas and
bring them to your favourite system

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or you maybe you think that react is cool
and you can tribute to it.

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Lets talk about what makes user interfaces
difficult to build.

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Has anyone build an user interface before?

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Alright, OK. I figured it.

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Was it really easy?

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Yeah, testing it was super-easy,

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maintainng quality was probably
a joke, right.

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It's just a kind a .. always works

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He said sarcastically

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But you get this a lot

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This doesnt feel right

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So, you know - even if you use all the test driven
development that you can throw at it

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you still have to have a human look at this

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this doesnt look right and
this doesnt fell right

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and when I click this button and I click this button
and I click this button ... it breaks

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There's a lot of things that come in to this

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They are human verifiedy but UIs
are also deceptely complex