text stringlengths 1 81 | start float64 0 10.1k | duration float64 0 24.9 |
|---|---|---|
occasionally want an alert but I don't | 1,455.54 | 3.96 |
want an alert every single time I could | 1,457.58 | 3.39 |
add a condition I could say something | 1,459.5 | 2.94 |
like if I only want to display an alert | 1,460.97 | 3.69 |
every time I count to a multiple of 10 | 1,462.44 | 4.29 |
like 10 and 20 and 30 and 40 and 50 and | 1,464.66 | 4.14 |
so forth I could add a condition that | 1,466.73 | 6.06 |
says that if counter mod 10 and mod just | 1,468.8 | 6.09 |
gets me remainder when you divide by 10 | 1,472.79 | 3.6 |
so if you take the counter divide it by | 1,474.89 | 4.44 |
10 if the remainder is 0 when I divide | 1,476.39 | 4.919 |
by 10 well that means counter is a | 1,479.33 | 4.2 |
multiple of 10 and so I can now display | 1,481.309 | 4.681 |
an alert where I can display annele | 1,483.53 | 4.529 |
that says like I want to say something | 1,485.99 | 4.53 |
like the counter is now 10 or the | 1,488.059 | 4.651 |
counter is now 20 and in order to do | 1,490.52 | 3.87 |
that what I really want to do is have | 1,492.71 | 5.31 |
some way of plugging in a variable into | 1,494.39 | 6.57 |
a string inside of JavaScript and in | 1,498.02 | 4.53 |
Python the way we would have done this | 1,500.96 | 3.9 |
is by you appending f4 prepending F in | 1,502.55 | 3.629 |
front of the string to create a | 1,504.86 | 3.42 |
formatted string and then I would have | 1,506.179 | 4.621 |
said something like the count is now and | 1,508.28 | 5.22 |
then I'd use curly braces to say go | 1,510.8 | 4.41 |
ahead and print out the value of counter | 1,513.5 | 3.809 |
so this f4 formatted string followed by | 1,515.21 | 3.66 |
this string would have been the way in | 1,517.309 | 2.941 |
python that we would have done this | 1,518.87 | 3.24 |
turns out javascript does the same thing | 1,520.25 | 3.87 |
just with slightly different syntax it | 1,522.11 | 4.98 |
doesn't use F instead instead of using | 1,524.12 | 4.74 |
the regular quotation marks whether the | 1,527.09 | 3.469 |
single or double quotation marks | 1,528.86 | 4.47 |
JavaScript uses these backticks | 1,530.559 | 4.841 |
which are usually located above the tab | 1,533.33 | 5.37 |
key on a standard u.s. keyboard and this | 1,535.4 | 5.01 |
is going to create what JavaScript calls | 1,538.7 | 3.72 |
a template literal where I can then | 1,540.41 | 3.39 |
substitute the value of a variable | 1,542.42 | 3.96 |
somewhere inside of this template and | 1,543.8 | 4.59 |
then in order to actually do the | 1,546.38 | 4.29 |
substitution while Python uses double | 1,548.39 | 4.26 |
curly braces to say plug in the value of | 1,550.67 | 3.9 |
counter right here javascript does | 1,552.65 | 3.54 |
something similar it also uses double | 1,554.57 | 3.3 |
curly braces but there needs to be a | 1,556.19 | 3.36 |
dollar sign in front of it the dollar | 1,557.87 | 3.54 |
sign and then the dollar double curly | 1,559.55 | 3.99 |
braces we can go ahead and plug in the | 1,561.41 | 5.19 |
value of a variable there so this then | 1,563.54 | 5.55 |
is a template literal where every time | 1,566.6 | 4.44 |
we get to a multiple of ten we're going | 1,569.09 | 3.51 |
to display an alert that says the count | 1,571.04 | 4.38 |
is now and then this dollar sign curly | 1,572.6 | 5.1 |
brace means actually plug in whatever | 1,575.42 | 5.009 |
the value of counter happens to be right | 1,577.7 | 5.609 |
there so now if I go ahead and refresh | 1,580.429 | 5.671 |
counter it starts at zero I can count 3 | 1,583.309 | 5.671 |
4 5 6 7 8 9 but when I get to 10 then I | 1,586.1 | 4.86 |
get an alert that says the count is now | 1,588.98 | 4.65 |
10 and then I see the result update on | 1,590.96 | 5.25 |
the page and so that template literal | 1,593.63 | 5.07 |
can allow us to combine variables and | 1,596.21 | 4.56 |
strings in order to generate new strings | 1,598.7 | 4.74 |
that are able to represent data inside | 1,600.77 | 6 |
of them as well so now what improvements | 1,603.44 | 4.98 |
can we begin to make it what changes can | 1,606.77 | 3 |
we make to this to improve upon the | 1,608.42 | 3.3 |
design of it well one thing especially | 1,609.77 | 3.78 |
as our programs get a little bit more | 1,611.72 | 3.089 |
sophisticated a little bit more | 1,613.55 | 3.509 |
complicated is that we often don't want | 1,614.809 | 5.521 |
to be intermingling our JavaScript code | 1,617.059 | 5.401 |
with the contents of our HTML the down | 1,620.33 | 4.14 |
here we have button on click equals | 1,622.46 | 3.87 |
count this name of this function and | 1,624.47 | 3.9 |
especially as our page starts to get | 1,626.33 | 3.93 |
more complicated it's going to start to | 1,628.37 | 3.689 |
get a little bit annoying if we're | 1,630.26 | 3.63 |
constantly having to maintain a little | 1,632.059 | 3.301 |
bit of JavaScript code like making a | 1,633.89 | 3.539 |
call to a function inside of our HTML | 1,635.36 | 3.689 |
we'll see a little bit later there are | 1,637.429 | 3.151 |
other paradigms that actually encourage | 1,639.049 | 3.691 |
this type of thing but right now it can | 1,640.58 | 4.05 |
start to get a little poorly designed if | 1,642.74 | 3.84 |
we'd really like to separate all of our | 1,644.63 | 4.139 |
JavaScript related code from all of the | 1,646.58 | 4.55 |
HTML the general structure of our page | 1,648.769 | 4.77 |
and so there are ways we can begin to do | 1,651.13 | 4.98 |
that as well I can add an event listener | 1,653.539 | 5.88 |
inside of JavaScript to that I can say | 1,656.11 | 7.419 |
something like document dot query | 1,659.419 | 8.911 |
selector button and then I can say dot | 1,663.529 | 10.081 |
on click equals count so what's going on | 1,668.33 | 7.26 |
here and I can do this instead of this | 1,673.61 | 3.96 |
on click equals count what I'm now | 1,675.59 | 4.829 |
saying is document query selector button | 1,677.57 | 5.219 |
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