Conditional code

Question 1

What is the basic building block of the “IF” statement in javascript

Answer 1

if ( . . . ) { . . .

}

Question 2

( . . . ) represents ____________

Answer 2

If (The condition is true) {
Then do what is between this
}

( . . . ) = If this condition is true

Question 3

{ . . . } represents _____________

Answer 3

If (The condition is true) {
Then do what is between this
}

{ . . . } = then do what is between these curly braces

Question 4

( 1 )

Answer 4

Parentheses

Question 5

[ 1 ]

Answer 5

brackets, oftentimes called square brackets

Question 6

{ 1 }

Answer 6

curly braces

Question 7

what is the purpose if braces, parenthesis, and brackets in coding?

Answer 7

They mark where a type of statement begins and ends

Question 8

are braces, parenthesis, and brackets sometimes interchangeable?

Answer 8

NO, never change them nigga

Question 9

brackets, braces, and parenthesis are always found in….

Answer 9

PAIRS

Question 10

ALL conditions must boil down to….

Answer 10

true or false

Question 11

how do you check for quality in a javascript condition?

Answer 11

==

double equal sign

If ( a==99) { execute this command
}

Question 12

why is == a quality check and not one equal sign?

*Why use:
If ( a==99) { execute this command
}

and NOT

If ( a=99) { execute this command
}

Answer 12

because 1 equal sign SETS a value. a==99 means CHECK if a==99, and a=99 means a IS 99

If ( a==99) { execute this command
}

If ( a=99) { execute this command
}

Question 13

how do you check inequality? that is check if a is NOT some variable

Answer 13

If ( a!=99) { execute this command

}

Question 14

code block

Answer 14

several statements all grouped together, normally with the use of braces, parenthesis, or brackets.

Question 15

how many lines if “IF” statements can javascript understand?

Answer 15

theoretically, infinite…

Question 16

Why don’t we want to use too many if statements? What are other options?

Answer 16

It can become difficult for a human to understand. We can use functions or switches instead.

Question 17

equality is used

Answer 17

when we want to check one variable against another

If ( balance == 10000) {Some command
}

the == operates as the equality operator

Question 18

single “=” equal sign is known as the ___________ operator

Answer 18

assignment operator

you are telling javascript what you want some variable to be

Question 19

double “==” equal sign is known as the ___________ operator

Answer 19

equality operator

you are asking javascript to check if the value of one variable is the same as another and to produce a true or false

Question 20

triple “===” equal sign is known as the ________ operator

Answer 20

strict equality operator

a more “strict” version of ==

Question 21

var a = 123;
var b = "123";

if ( a == b ) {
   alert("Yes, they ARE equal");
} else {
   alert("No, they're NOT equal");
}

**Will this alert yes, or no?

*NOTE double equal sign

Answer 21

Yes

123 is the same as “123”

Question 22

var a = 123;
var b = "123";

// equality check
if ( a === b ) {
   alert("Yes, they ARE equal");
} else {
   alert("No, they're NOT equal");
}

**Will this alert yes, or no?

*NOTE triple equal sign

Answer 22

No

123 is a number and “123” is a character string

Question 23

How do you do the not equal to operator to check an equality?

Answer 23

(a != b)

Question 24

how do you use the strictly not equal to operator?

Answer 24

(a !== b)

Question 25

how do you perform an “AND” operator in javascript?

Answer 25

&&

double ampersand

Question 26

how do you write a condition for a has to equal b, and c has to equal d

Answer 26

if ( a===b && c===d) {…

{

Question 27

how to you write an OR operator in javascript?

Answer 27

||

double vertical line

Question 28

what is the difference between :

if ( a===b && c===d) {…
{

and

if ( (a===b) && (c===d) ) {…
{

Answer 28

no difference, trick question

Question 29

rewrite using SWITCH:

var grade = “Premium”;

if ( grade === "Regular") {
     alert("It's $3.15");
}
if ( grade === "Premium") {
     alert("It's $3.35");
}
if ( grade === "Diesel") {
     alert("It's $3.47");
}

Answer 29

var grade = “Premium”;

switch (grade) {

case “Regular”:
alert ( “It’s $3.15 “ );
break;

case “Premium”:
alert ( “It’s $3.35” );
break;

case “Diesel”:
alert ( “It’s $3.47” );
break;

default:
alert(“Not valid grade”);
}