Comparison operators in Javascript - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the == operator do in JavaScript?

The == operator compares two values for equality, allowing type conversion if needed. For example, 5 == '5' is true because the string '5' is converted to number 5 before comparison.

beginner

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

== checks for equality with type conversion, while === checks for equality without type conversion (strict equality). So 5 == '5' is true, but 5 === '5' is false.

beginner

What does the != operator do?

The != operator checks if two values are not equal, allowing type conversion. For example, 5 != '6' is true because 5 is not equal to 6 after conversion.

beginner

How do the < and > operators work?

The < operator checks if the value on the left is less than the value on the right. The > operator checks if the left value is greater than the right value. Both compare numbers or strings based on Unicode order.

beginner

What is the purpose of <= and >= operators?

The <= operator checks if the left value is less than or equal to the right value. The >= operator checks if the left value is greater than or equal to the right value.

What will 5 == '5' return in JavaScript?

A undefined

B false

C TypeError

D true

== compares values with type conversion, so '5' is converted to number 5, making the comparison true.

Which operator checks equality without type conversion?

A !=

B ===

C ==

D <=

=== checks strict equality, meaning both value and type must be the same.

What does 10 >= 10 evaluate to?

A true

B TypeError

C undefined

D false

>= means greater than or equal, so 10 is equal to 10, making it true.

What is the result of 'apple' < 'banana'?

A false

B TypeError

C true

D undefined

Strings are compared by Unicode order. 'apple' comes before 'banana', so it is true.

Which operator means 'not equal' with type conversion?

A !=

B !==

C ===

D ==

!= checks if values are not equal, allowing type conversion.

Explain the difference between == and === operators in JavaScript.

Think about how JavaScript treats types when comparing.

List and describe the main comparison operators used to compare numbers or strings in JavaScript.

Focus on operators that compare values and their meanings.