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with arrow functions if you ever have a
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3.42
very simple function that all it's doing
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3.57
is taking something and returning
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4.17
something else I can simplify this
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4.86
function even further and just say I can
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4.05
omit the curly braces I can omit the
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2.01
return
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3.36
I can just say response arrow response
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4.86
Jason and this is a shorthand way of
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4.38
saying a function that takes as input
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4.44
the response and returns as output
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5.7
response to Jason so here I'm saying go
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5.1
ahead and fetch me in the latest
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3.71
exchange rates from this particular API
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4.83
then convert the response to Jason data
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6.88
and then once you have the data here's
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6.9
what I want you to do with that data and
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4.65
for now let's just go ahead and console
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4.38
dot log that data just to print it out
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4.08
to the terminal so we're not doing
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3.12
anything else to us yet all I'm doing is
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3.93
saying get me the exchange rates convert
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4.32
the exchange rates data into Jason and
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4.41
then let's go ahead and print out that
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6.45
data so I'll open up currency at HTML
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6.48
it's a blank page but if I look in the
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4.8
JavaScript inspector I see what got
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4.35
logged is a JavaScript object here
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4.2
indicated by the word object and if I
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4.35
click the triangle at left I can open up
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4.02
and see all right inside of this object
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5.75
is all of this data about exchange rates
6,002
6.09
for a whole bunch of different exchange
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3.61
rates for converting from the US dollar
6,008.09
3.45
we're here u.s. dollar one means one
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3.81
u.s. dollar is one u.s. dollar for
6,011.54
5.01
example so now that I've got this data
6,013.46
5.73
let's actually try and use this inside
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4.14
of the program maybe let's say I want to
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3.87
convert between US Dollars and the
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3.54
to figure out what the conversion rate
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3.63
is between dollars and euros well if we
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4.68
recall what the data looks like the data
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5.82
is a JavaScript object where we have a
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7.08
key called rate and inside of rates is
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5.94
this object and inside of that object I
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5.43
can access the EU our property to get
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4.77
the exchange rate of one US dollar is
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3.72
equal to some number of euros for
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4.05
example so it's inside of the rates key
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4.83
and then inside of the EU our key and
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5.22
that's how I know what to get access to
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6.48
inside of my data so what I really want
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10.11
to do is access data dot rates dot EU R
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8.04
it says get me to all the data that came
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4.95
back access the rates key and then
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5.67
access the euro key and we'll go ahead
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4.92
and save that in a variable called rate
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6.69
and now I'll just document query
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7.08
selector body dot innerhtml
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5.4
equals rate just like take that rate put
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5.64
it inside of the body so now if i
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6.03
refresh currency dot HTML what I see is
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5.7
just this value 0.9 zero eight eight
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3.99
four three which means that right now
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3.51
one u.s. dollar happens to be equal to
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4.32
about zero point nine one euros for
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5.16
instance so that's useful I could make
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4.68
this a little more human-friendly by
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3.6
putting this inside of a template string
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5.13
I could say one US dollar is equal to
6,103.16
8.37
and then rate euros for example and so
6,106.4
8.13
now if i refresh the page I see one u.s.
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5.64
dollar is equal to this many euros and
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4.38
even this is a little bit annoying I
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2.91
probably don't care about it too this
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3.18
many decimal places and some really in
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3.63
the mood to be very precise about these
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3.51
exchange rates if I only care about it
6,123.71
4.14
to like 3 decimal places for example it
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4.17
turns out JavaScript has functions I can
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4.73
use on numbers like rate dot two fixed
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5.76
passing in three as an argument there to
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4.39
mean I'd like to take this exchange rate
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3.6
and just round it to three decimal
6,136.97
4.8
places for example so now i refresh the
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5.16
page and I see one u.s. dollar is equal
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4.86
to zero point nine zero nine euros and
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3.45
the interesting thing about what's
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3
happening here is this is happening as a
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4.29
result of an asynchronous request I am
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4.89
asking for the latest exchange rates and
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4.619
when I get back the exchange rates date
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4.229
javascript is plugging that information
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3.99
into the body of the page I now
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4.321
communicating with an API getting back
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5.01
that api's data in JSON form and then
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5.25
using that data to update the contents
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6.09
of my HTML page of course in practice if
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5.369
I really want a currency exchange web
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3.66