- Reviewing Our Feedback 6:11
- Conditional ints 3 objectives
- Parsing Integers 3:46
- Parsing Integers 1 objective
- Censoring Words - Using String Equality 4:51
- String Equality 2 objectives
- Censoring Words - Using Logical ORs 4:31
- Using Logical ORs and ANDs 5 questions
- Censoring Words - Looping Until the Value Passes 7:16
- Looping until the value passes 3 objectives
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Censoring Words - Using Logical ORs
4:31In this video, we will learn how to check multiple conditions in one statement using a logical OR statement.
Now that we know how to block
on a single specific word.
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Let's expand our reach, and
block more than just one offensive word.
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Now one trait that we have at our
disposal, is that we can check
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multiple conditions by using what is
known as a logical or expression.
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Which means we can do something like this,
if the noun is dork, or
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the noun is jerk, exit the application.
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In fact you could chain these or
statements on forever.
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Let's go introduce a logical OR
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into your application to block the user
from entering either dork or jerk.
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Blocking against the word jerk in
our code is actually pretty easy.
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In fact the only thing I think I need to
show you is what OR syntax looks like.
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So let's go to our IF statement when
we were checking for dork in the past.
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Let's add an OR statement in here, so
we're gonna do a double pipe symbol.
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Pipe is above the enter key.
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That's what OR looks like so
it's gonna say noun
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equals ignore case or
noun equals lowercase on jerk.
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Great.
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Now this line is getting a little bit long
and in fact if we added one more OR on
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here probably go off the screen and then
somebody might not see that it's there.
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So one way that we can do to battle
that is because we're inside of this
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parenthesis here.
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We can add a new line and
take advantage of that space.
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So now looks much better.
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While we were writing that, one thing that
you might have thought was that you could
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do the same thing with two if statements,
right?
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You could write this if statement here
you could say equalsIgnore "dork" or
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you can make another one that
says if noun.equalsIgnore "jerk".
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But what would happen then is that you'd
be writing these same lines inside of
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these, this code block here,
you'd be writing that same code twice.
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And that's never a good idea.
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All right so let's give this a go.
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I'm gonna save it and
then I'm gonna compile and run.
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I'll say 20.
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And we will do big and we're gonna put
in jerk here, great, we caught it.
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So let's walk that really quick.
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So what we've done here is we have this
first line that's gonna come in here.
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It's gonna say noun, and we put in, jerk.
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So noun is gonna be jerk.
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And it says, if noun equals dork,
and that's a false.
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So that's going to say false.
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So, false or true.
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Right, because noun equals jerk and
it does so we're going to say false or
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true and if you imagine that
anytime there's a true in there.
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It's gonna be true.
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Okay, so
let's make sure that the dork still works.
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Awesome it does after using this a bit,
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I think we need to do something
different about that exit.
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It would be good to give the user
a second chance to enter a nicer word.
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Let's see if we can't fix
that in the next lesson.
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And one more thing I wanted
to show if you wanted to do
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another one of these you can always
chain them with another one.
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So right?
So if we wanted to say.
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Another guy here, say nerd.
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All right perfect and
that is how Ors work.
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Great we just learned one way that we
could check multiple conditions in one
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IF statement.
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By not making two identical code
blocks we avoided repeating ourselves.
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A goal of programming is to make sure
that you don't repeat yourself or
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often referred to as DRY.
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As you advanced through your learnings,
you'll hear this phrase often and I'm sure
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it will be hammered into your thinking
as you begin coding bigger applications.
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What were you thinking about logic?
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I'd like to also introduce you
to ORs counterpart which is AND.
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Well OR
returns true if any statement is true and
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will only return true if
all expressions are true.
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Logical and
use the double ampersand simple
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as this logic is such an important
concept and used all over the place.
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Let's go back and
review our dating site analogy.
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So an example of an OR
statement is must love cats or dogs.
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A cat lover would be tested and
she'd say, do you love cats?
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And she'd say gee, yes,
yes, yes, yes, yes.
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No need to ask about dogs as this
person definitely met the requirement.
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Now let's look at another example.
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The request is younger than 40 and
has no children and loves art.
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This elderly gentleman has
prompted how old he is.
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And there is no need to go on asking any
further questions as he doesn't meet
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all the conditions.
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Okay, so
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let's take a really quick exercise
around the statements before we move on.
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