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Content
0.107 -> Guys, in today's video we'll
see what error objects are.
3.313 -> How do error objects work? And
how can you throw a custom error?
6.999 -> For example, if the user puts in
the wrong information, then I want
10.605 -> to throw a custom error to the user.
12.999 -> How is this done in JavaScript? Let's go
to our computer screen and get started...
23.545 -> So, guys, let's learn about error objects.
25.756 -> As a result, I'd like
to create a new repl.
28.317 -> I'll simply make a new repl and that will
33.402 -> Wait a minute...
37.209 -> I'll go to my profile and then,
40.475 -> We'll talk about error objects.
43.098 -> Now if you don't know what they are,
45.202 -> so the "err" from our
last session is the error
47.618 -> object, about which
we'll talk in detail today.
50.036 -> This is our video no. 61,
54.202 -> so I'll type "61_error_object".
59.695 -> Let's create a repl and move to our notes.
62.289 -> "For all the built in errors, the
error object has 2 main properties"
65.967 -> Error object has 2
properties for built in errors.
68.702 -> What are they?
70.232 -> "name" and "message"
are the two properties.
73.677 -> We rarely see stack, but these 2
are the main properties. So let's
79.343 -> produce an error and
then we'll see how we can
83.828 -> use try catch error. So I'll take
try catch error and in try I'll type
88.659 -> "Harry", which is a variable and is not
defined,so it's obvious
92.853 -> that we'll see an error.
94.442 -> And we want to see that error so that,
98.783 -> we understand these
things. So please focus here
103.422 -> I'll type console.log
107.9 -> So I just typed harry here.
111.782 -> and it prints "harry is not defined". This
whole error prints here. But if I write
119.285 -> error.message, then see
how this changes. Rather than
122.531 -> doing this, I'll put in error.name
and error.message and run them.
127.523 -> So I'll type error.name
130.015 -> and I'll type error.message.
So name done, message done;
134.667 -> Let me reload so that
you can see what name is
138.848 -> Name is a reference error.
142.335 -> And this "harry is not
defined" is the message.
145.633 -> So we can use this
error's name and message
149.633 -> to indicate or identify or to take a set
of actions when a reference error occurs.
155.795 -> Do this if you get a syntax error,
or do this for something else.
159.423 -> Now let's say I want to
throw custom errors here.
161.912 -> I'll only tell you how
to throw custom errors.
164.756 -> If you want to throw
custom errors and you type
169.352 -> "throw new error" and then
175.458 -> you type "Harry is not good"
and throw this error here;
180.889 -> and reload it. So you'll see
183.695 -> this is an error and "harry is no" which
is also an error. Now if I type throw new
188.591 -> reference error.
191.404 -> Then you'll get "type of error: reference
error". Let me reload this properly.
200.092 -> Let's save this. If I typed throw new
reference error then it should come.
206.432 -> See, reference error has
come "Harry is not good".
210.085 -> Now if I do something like "error.stack",
215.35 -> and then "Harry = "
220.942 -> or let me just type console.log(harry)
228.488 -> Ok and then,
232.76 -> after doing this I reload it,
235.44 -> Reference error harry is not
defined, this stack prints here. Got it?
240.032 -> So I can also print error.stack
242.705 -> Now I'll tell you how to throw an custom
error, I have explained this in the notes
247.451 -> "for all the built in
errors, the error object
249.871 -> has 2 main principles: error and message"
252.061 -> And you can also print stack sometimes.
255.529 -> and you can throw your own
error by using throw syntax.
261.441 -> Like here, if age > 80 then print invalid
age. So let's quickly type a program,
267.721 -> and with that program we'll ask users that
273.439 -> let age = prompt("Enter your age")
282.269 -> and after this we'll type if
286.1 -> and I'll try all these things that if i
get an error I'll catch it through catch.
290.806 -> and I'll do one more thing here,
295.718 -> The script is still running. Ok?
300.356 -> and I tried age = prompt
enter your age and then
304.206 -> I'll definitely want to
convert this into an integer.
308.793 -> So for making it a integer I'll type
312.603 -> age = Number.parsInt(age)
319.085 -> and then console. log.
322.182 -> And then if age > 120
328.355 -> I'll put throw new error,
this is probably not true
333.909 -> Let's do it 130 or 150, alright. Don't
feel sad. This is probably
341.258 -> not true. And after doing this,
346.701 -> simply I'll save it I'll show you
350.54 -> enter your age 89. The
script is still running. And then
357.664 -> I put a bit more. This is a reference
error. This is probably not true.
362.67 -> and "This is not true" comes
as I also print error.stack.
367.63 -> So you can do such things
within your real time script.
370.936 -> You can throw syntax error, reference
error and many more types of error
377.24 -> And you can search
mdn reference js errors.
382.719 -> And you'll get every error
like range error, internal error
386.731 -> You'll see all type of
errors of javascript here.
390.342 -> You can study them and then deploy too.
395.356 -> Here you can learn how to deploy
them but a good idea will be that
399.995 -> You'll perform things like
this whenever you please.
402.839 -> So I hope you know how
to throw custom errors,
405.189 -> In next video we'll definitely talk about
clause and a very handy use case of it
409.314 -> where clause is actually used
about which, many people don't know.
414.022 -> We'll cover it in the next video.
416.031 -> If you haven't accessed
javascript playlist yet,
418.669 -> or you are having
trouble using my replits,
423.615 -> so you should
browse replit.com/@codewithharry and,
428.906 -> access ultimate javascript course folder.
You'll find every single replit there.
436.393 -> You'll get every single one of them there.
438.717 -> I did this so that you can directly
clone all of this by using a fork
442.258 -> and start doing your work.
because otherwise it's a hassle to do.
445.601 -> Unlike copying the code, you
can fork it and use it directly here.
451.891 -> You can run code directly
inside the repl. Got it?
457.37 -> So please access
this playlist and save it.
460.871 -> Thank you so much for
watching this video guys.
