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write React Native if you were to
start your own personal project | 4,166.3 | 4.019 |
or assignment for the course. | 4,170.319 | 3.16 |
So I've been talking about this
company called Expo quite a bit. | 4,173.479 | 3.21 |
And what they do is they create
a very fast way to build an app. | 4,176.689 | 3.46 |
They provide a lot of
tooling around React | 4,180.149 | 1.75 |
Native and the React native community. | 4,181.899 | 3.302 |
So there are a suite of tools to
accelerate the React Native development | 4,185.201 | 2.999 |
process. | 4,188.2 | 1.047 |
And so one that we've
been using quite a lot | 4,189.247 | 1.833 |
is this thing called Snack,
which is this website here. | 4,191.08 | 3.81 |
We've used it this course,
a lot this lecture and last. | 4,194.89 | 5.58 |
And what that allows us to do is
run React Native in the browser. | 4,200.47 | 3.06 |
So it automatically
bundles any libraries | 4,203.53 | 2.49 |
that we need like React
Native, React, and then | 4,206.02 | 3.75 |
it also runs on a phone
embedded into the browser. | 4,209.77 | 2.55 |
They also give us a tool
called the XDE which | 4,216.1 | 3.03 |
is a GUI, graphical user interface,
to serve share and publish any Expo | 4,219.13 | 4.8 |
projects that you have. | 4,223.93 | 2.31 |
They also give us a command
line interface to do | 4,226.24 | 2.04 |
the same things, to be a command line. | 4,228.28 | 3.52 |
They give us the Expo client which,
if you saw my email from earlier, | 4,231.8 | 4.25 |
is an iPhone app that you can
install and actually run stuff | 4,236.05 | 4.29 |
that you write in Snack or
stuff that you write and manage | 4,240.34 | 4.29 |
by the XDE or the CLI to actually
run it on your phone while developing | 4,244.63 | 5.31 |
and before you publish. | 4,249.94 | 2.61 |
And lastly they give us an
SDK, software development kit, | 4,252.55 | 3.09 |
which bundles and exposes
cross-platform libraries and APIs. | 4,255.64 | 3.93 |
And so included in that are maps, stuff
for like icons and images and SVGs | 4,259.57 | 8.01 |
and maybe animations. | 4,267.58 | 1.56 |
They also give us handy constants. | 4,269.14 | 1.56 |
So the Expo that we imported into
this app is actually the SDK, | 4,270.7 | 5.94 |
and it gave us a constant
like, we didn't use it here | 4,276.64 | 4.32 |
but, the height of the status bar. | 4,280.96 | 3.72 |
And so they give us a
lot of helpful things | 4,284.68 | 2.49 |
to really get our developing
process moving forward. | 4,287.17 | 3.86 |
And so let's take a look at
this thing called the XDE. | 4,291.03 | 3.76 |
So I have it here. | 4,294.79 | 1.44 |
It's a little bit small but
basically what this is is it | 4,300.07 | 3.9 |
allows us to create and run projects. | 4,303.97 | 2.38 |
And so I actually already created
this project before the class, | 4,306.35 | 5.04 |
but when you do create your project
it allows you to choose a template | 4,311.39 | 4.16 |
and basically create the directory
and all of its dependencies | 4,315.55 | 5.01 |
on your computer. | 4,320.56 | 1.23 |
And so, if you started with the blank
like I did and created my new project, | 4,321.79 | 4.53 |
it gives you a chance to
save it wherever you'd like. | 4,326.32 | 7.2 |
But I already went and did that
process and created my new project. | 4,333.52 | 2.97 |
And so, if you want to
follow along at home, | 4,336.49 | 2.07 |
you just do create new project,
blank, save it wherever you like | 4,338.56 | 3.96 |
and then you end up right here. | 4,342.52 | 3.76 |
And basically what this is, is
this is running a bunch of things | 4,346.28 | 2.81 |
behind the scenes including React Native
packager which handles the bundling | 4,349.09 | 3.81 |
and whatnot of your app and any
logs if you want to console log, | 4,352.9 | 5.37 |
will also appear in this XDE. | 4,358.27 | 2.31 |
And so what it's doing is it's
actually looking in that directory | 4,360.58 | 2.97 |
that it created on your computer. | 4,363.55 | 2.278 |
And so if you create it and then CD into
the correct directory on your computer | 4,374.11 | 3.78 |
you end up right here. | 4,377.89 | 1.08 |
And so when you create
a new file you see | 4,381.942 | 1.708 |
this thing called app.json
which is basically | 4,383.65 | 5.45 |
a bunch of metadata that's
created about your project and is | 4,389.1 | 2.5 |
how Expo tracks your app. | 4,391.6 | 3.21 |
And then you see this
thing called app.js. | 4,394.81 | 1.75 |
And that is basically the bare bones
React Native app that you start with. | 4,400.48 | 6.92 |
And when you run it, if you open it
up on a device, you see it run here. | 4,407.4 | 8.106 |
And so this says, open up app.js
to start working on your app. | 4,418.86 | 3.82 |
And if I were to change the text here
and save, we can see it re-bundle. | 4,422.68 | 12.88 |
It's currently building
that new JavaScript bundle | 4,435.56 | 2.13 |
and then you see here, live on the
phone, that you did update that text. | 4,437.69 | 5.58 |
And so, if you want to start
working on your project earlier | 4,445.89 | 4.31 |
or work on any personal projects of
your own, you're welcome to use Expo. | 4,450.2 | 3.48 |
I actually encourage you
to use Expo because they | 4,453.68 | 2.79 |
take a lot of annoying
and difficult parts | 4,456.47 | 2.79 |
about creating projects
and publishing them | 4,459.26 | 1.847 |
and do all the hard work for you
so that all you have to worry about | 4,461.107 | 2.833 |
is writing the JavaScript here. | 4,463.94 | 1.291 |
Cool. | 4,470.33 | 0.99 |
And so we've been doing this thing a
lot in this lecture and previous ones | 4,471.32 | 4.089 |
called importing and exporting. | 4,475.409 | 1.291 |
And we haven't actually
talked about what is. | 4,476.7 | 2.65 |
And so we have talked
a lot about components | 4,479.35 | 3.1 |
and how we should break up components. | 4,482.45 | 2.372 |
And it's actually also highly encouraged
that you break up the components | 4,484.822 | 3.968 |
into their own files. | 4,488.79 | 1.49 |
And so we've seen that components
are great for simplifying your code | 4,490.28 | 3.234 |
and we can actually split
them into their own files. | 4,493.514 | 2.166 |
And then what this allows us to do is
help organize the project even more. | 4,495.68 | 5.19 |
Rather than having everything all
in one big super long file, which | 4,500.87 | 3.75 |
might get very unwieldy, we
can actually organize things | 4,504.62 | 2.46 |
into their own separate files
or even separate folders | 4,507.08 | 3.57 |
so it's easy to find whatever
code you need to update. | 4,510.65 | 3.89 |
Then what we do is from the
file that we create we actually | 4,514.54 | 3.37 |
export the component that we want. | 4,517.91 | 2.89 |
And then we can then import it in to
another file if we want to use it. | 4,520.8 | 4.82 |
And there are a couple different
ways to import and export. | 4,527.732 | 2.458 |
There's this thing
called a default export, | 4,530.19 | 2.12 |
and there's this thing called
a named import and export. | 4,532.31 | 2.88 |
And so what I was typing a
lot earlier is you see me type | 4,535.19 | 4.57 |
this thing called export
default class app. | 4,539.76 | 2.62 |
And that's me saying, hey
from this file here I actually | 4,542.38 | 3.43 |
want to export this app. | 4,545.81 | 1.56 |
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