Question

Continuing where we left off: JavaScript lesson number 2

Answer 1

All code on this post can be ran using Google Chrome Console.
You can open the console like this:
Windows: `Control + Shift + J`
Mac: `Command + Option + J`

Answer 2

Now with mac support :')

Answer 3

When we left off we were discussing Variables, Constants, Functions, and Datatypes

This time we will be focusing on If/Else, Comparitors, Arrays, and JSON

Answer 4

This all says an hour ago. Is Jay typing out an essay?

Answer 5

it should say 6 minutes ago....

Answer 6

he made this post 13 mins ago shad

Answer 7

Let's start with comparitors (wrong term for it, the correct term is operators)

Comparing:
> Greater Than
>= Greater than or equal to
< Less Than
<= Less Than or equal to
== Equal to
=== Equal to same data type
!= Does not equal
!== Does not equal same data type
&& and
|| or
! not
typeof Type of the input

Operations:
% Modulus, it divides and returns the remainder of the division
+ Addition, it adds both numbers, and combines strings together
- It subtracts
/ Division
* Multiplication
++ Increments a number
-- Decrements a number
= set's the value of something
+= Addition to the current value (or combining strings)
-= Subtraction from the current value
*= Multiplication from the current value
/= Division from the current value
%= Modulus from the current value

Answer 8

Any questions thus far?

Answer 9

What is "data type"?

Answer 10

Oh, and here's the link to the previous post for those who missed it
https://questioncove.com/study#/updates/5a99be7a2117d6522969c000

Answer 11

A data type is the type of data, be it string, integer, boolean, function, array, or JSON

Answer 12

Any other questions?

Answer 13

No sir

Answer 14

To briefly explain a if statement:
```javascript
if (conditon) {
//code
}
```

```javascript
if (conditon) {
//code
} else {
//code
}
```

```javascript
if (conditon) {
//code
} else if (condition) {
//code
} else {
//code
}
```

Alright, let's move onto actually putting those to use in examples

Let's say we have this:
```
var x = 5;
var y = 25;
var z = x+y; //should be equal to 30
if (z == 30) {
console.log('Evaled to true!');
} else {
console.log('Evaled to false!');
}
```

Answer 15

You should see `Evaled to true!` in the console

Answer 16

Got it

Answer 17

Same!

Answer 18

nuts

Answer 19

Let's now move onto a example of || and &&

```
var op1 = 2+3 == 5; //Evaluates to true
var op2 = 50+25 == 75; //Evaluates to true
var op3 = 5+10 == 14; //Evaluates to false

if (op1 && op2 || op3) {
console.log('True!');
}
```
this code adds a bunch of numbers, and compares them, op1 and op2 are true, but op3 is false, yet the if statement still evaluates to true, this is because it asks if
op1 AND op2 are true, OR if op3 is true so it get's through


Make sense?

Answer 20

Yes sir ^-^

Answer 21

Yes

Answer 22

Using your knowledge from both lessons, I want you to write a function that contains a if statement, and returns the value of a operation if it evaluates to false, otherwise output something else.
Any questions on these instructions?

Answer 23

Done. In you faceeee.

Answer 24

Yos*

Answer 25

Welp. You copy+pasted what I had, you didn't need to change the comment, and it's not a function

Answer 26

Damn it.

Answer 27

>wait for ಠ_ಠ

Answer 28

Looks right to me. A++++ ~o-o~

Answer 29

It's not a function

Answer 30

Shall I post a solution?

Answer 31

Yeh

Answer 32

Ugh how do you make it not a function?

Answer 33

```
function homework(hello,world) {
var result = hello+world;
if (result == 10) {
return result;
} else {
return false;
}
}
```

Answer 34

Did that clear things up?

Answer 35

no, wut is homework for and 10

Answer 36

homework is the name of the function

10 is just a random number

Answer 37

you would run it and eval it to true by running `homework(5,5)`

Answer 38

Oh okie

Answer 39

is dat da solution to the homework you gave?

Answer 40

Yeh that is the solution

Answer 41

A solution*