L73_118 Prep for Test

What happens when the condition in the if statement contains the following condition (" ")?

• The code block runs

• The code block does not run

• An error is thrown

• The program crashes

What does an else if statement allow you to do?

• Declare variables

• Check multiple conditions in a single block of code

• Create infinite loops

• Define functions

If the condition is changed to true, what event will occur?

• Declare variables

• Check multiple conditions in a single block of code

• Create infinite loops

• Define functions

What is the output of the code shown?

• no output will be shown

• true

• false

• not equal

Answer explanation

The equality operator can lead to some strange behavior in JavaScript. For example, "0" == 0 is true, even though one is a string and one is a number. 

What is the output of the code shown?

• no output will be shown

• true

• false

• not equal

Answer explanation

The strict equality operator === is used to check if two values are equal and share the same type.

Which of the following are falsy values in JavaScript? Select all that apply

• null

• NaN

• "0"

• undefined

What is the output of the code shown?

• "Condition is true"

• "Condition is false"

• Nothing

• "Error"

What is the output of the code shown?

• Condition is true

• Condition is false

• It prints nothing

• It throws an error

What happens if the first condition in a JavaScript if-else chain is true?

• The code block for the if-else condition runs.

• The next condition in the chain is checked.

• The entire chain stops executing.

• The first condition runs.

What is the output of the code shown?

• Condition is true

• Nothing will output

• A switch case.

• A function call.

Answer explanation

A falsy value is the opposite - a value considered false when evaluated as a boolean. JavaScript has a defined list of falsy values. Some of them include false, 0, "", null, undefined, and NaN.