Comparisons, Variables, Logical Operators

Question 1

What are comparison operators?

Answer 1

They are used in logical statements to determine equality or difference between variables or values.

Question 2

What does the “ == “ comparison operator represent?

Answer 2

Equal to

Question 3

What does the “ === “ comparison operator represent?

Answer 3

Equal value and equal type

Question 4

What does the “ != “ comparison operator represent?

Answer 4

Not equal

Question 5

What does the “ !== “ comparison operator represent?

Answer 5

Not equal value or not equal type

Question 6

What does the “ > “ comparison operator represent?

Answer 6

Greater than

Question 7

What does the “ < “ comparison operator represent?

Answer 7

Less than

Question 8

What does the “ >= “ comparison operator represent?

Answer 8

Greater than or equal to

Question 9

What does the “ <= “ comparison operator represent?

Answer 9

Less than or equal to

Question 10

What are Logical Operators?

Answer 10

Logical operators are used to determine the logic between variables or values.

Question 11

What does the “ && “ logical operator represent?

Answer 11

And.
Sees if both values are the same/true.
Given that x = 6 and y = 3,
(x < 10 && y > 1) is true.

Question 12

What does the “ || “ logical operator represent?

Answer 12

Or.
Sees if there is at least one of the same/ true value.
Given that x = 6 and y = 3,
(x == 5 || y == 5) is false.

Question 13

What does the “ ! “ logical operator represent?

Answer 13

Not.
Turns true into false, and false into true.
Given that x = 6 and y = 3,
!(x == y) is true.

Question 14

What are Variables?

Answer 14

Variables are containers for storing values.

Question 15

What are the 3 key words used to declare Variables?

Answer 15

Var, Let, and Const.
var price1 = 5;
const price2 = 6;
let total = price1 + price2;

Question 16

When should the “ var “ keyword be used to declare a variable?

Answer 16

Only if you MUST support old browsers.

Question 17

When should the “ const “ keyword be used to declare a variable?

Answer 17

Always use const if the value should not be changed or when the type should not be changed (Arrays and Objects).

Question 18

When should the “ let “ keyword be used to declare a variable?

Answer 18

When the value of the variable changes. Only use let if you can’t use const.