JavaScript Fundamentals Quiz

What is the purpose of the 'let' keyword in JavaScript?

• To declare a function

• To declare a variable with global scope

• To declare a constant variable

• To declare a variable with block scope

Which of the following is a reserved word in JavaScript?

• function

• variable

• constant

• define

What does the camelCase convention refer to?

• Using all uppercase letters

• Capitalizing the first letter of each word except the first

• Using underscores between words

• Writing variables with spaces

Which operator is used for exponentiation in JavaScript?

• ^^

• exp

• ^

• **

What is the result of 'typeof null' in JavaScript?

• 'object'

• 'boolean'

• 'null'

• 'undefined'

Which method converts a string to an integer in JavaScript?

• String

• parseFloat

• Number

• parseInt

What is the difference between '==' and '===' in JavaScript?

• '==' checks value only, '===' checks type only

• '==' checks value and type, '===' checks value only

• '==' checks type only, '===' checks value only

• '==' checks value only, '===' checks value and type

Which logical operator represents 'AND' in JavaScript?

• &&

• &

• ||

• !

What does a guard-clause pattern help with in JavaScript?

• Handling exceptions

• Looping through arrays

• Declaring variables

• Simplifying conditional logic

Which control flow statement is used to execute code based on multiple conditions?

• if / else if / else

• while loop

• switch

• for loop