JavaScript Masterclass - Zero to Job-Ready with Hands-On Projects - Booleans and Comparisons / 015

This lecture focuses on the boolean data type in JavaScript, explaining its two possible values: true and false. It covers how booleans are used in conditions and comparisons, providing examples with strings, arrays, and numbers. The lecture also delves into the syntax of boolean values in JavaScript, emphasizing the importance of using lowercase 'true' and 'false'. Additionally, it explains string comparisons using ASCII values, highlighting how JavaScript evaluates character values. The session concludes with a preview of the next topic: loose versus strict comparison.

What are the two possible values of a boolean data type?

• Yes and No

• True and False

• On and Off

• 1 and 0

In JavaScript, which of the following is a valid boolean value?

• TRUE

• True

• 'True'

• true

What will be the result of the expression 'students.includes("Alex")' if 'Alex' is in the list?

• true

• undefined

• null

• false

Which operator is used to compare if two values are equal in JavaScript?

• =

• ==

• !=

• ===

What does the '!=' operator signify in JavaScript?

• Greater than

• Inequality

• Equality

• Assignment

If 'age' is 25, what will 'age >= 25' evaluate to?

• undefined

• true

• null

• false

How does JavaScript compare strings like 'ABC' and 'XYZ'?

• By length

• By number of vowels

• By ASCII values

• By alphabetical order

What is the ASCII value of the lowercase letter 'a'?

• 32

• 97

• 65

• 120

Which of the following comparisons will return true: 'abc' > 'ABC'?

• No, because of alphabetical order

• Yes, because of length

• No, because uppercase is greater

• Yes, because lowercase is greater

What should you do if you need to find the ASCII value of a character?

• Memorize all values

• Guess based on the alphabet

• Search online for an ASCII table

• Use a calculator