Conditional Logic

Question 1

What are truthy and falsy values?

Answer 1

Truthy and falsy values are values which are not booleans, but are evaluated by JavaScript as booleans.

Ex: an empty string '' evaluates to falsy.

Question 2

What is the !! operator?

Answer 2

The !! (aka double-bang) operator first asseses a value as either truthy or falsy and returns a boolean of the opposite of that value’s truthiness or falsyness, and then converts that boolean to the actualt truthy or falsy boolean of the variable.

Question 3

Whate are some examples of truthy values?

Answer 3

• true
• {}
• []
• new Date()
• '0'
• 42

Question 4

What are some examples of falsy values?

Answer 4

• false
• null
• undefined
• 0
• NaN
• ''

Question 5

What is the difference between the == operator and === operator?

Answer 5

The == operater compares loose equality, so 1 == '1' is true; whereas, the === operator compares strict equality, so 1 === '1' is false.

Question 6

What is the Ternary Operator, and what is its syntax?

Answer 6

The ternary operator is a simplified if/else statement.

ex: number === 1 ? 'One' : 'No Match