ITS Boot Camp C2

What are the primitive data types in JavaScript?

• String, Number, Boolean, Null, Undefined

• Array

• Object

• Function

Which keywords are used to declare variables in JavaScript?

• function
• const
• let
• var

What will be the value of x after executing var x = 10;?

• 10
• 5
• 20
• 15

Which primitive data type is used to represent a single character, in JavaScript?

• int
• string
• boolean
• char

How do you access the third element of an array named arr?

• arr[3]
• arr(2)
• arr.third
• arr[2]

Which method is used to add new elements to the end of an array?

• concat()
• insert()
• append()
• push()

How do you find the length of an array?

• array.length()

• array.size()

• array.count()

• array.LengthOfArray()

What does the method Array.isArray() do?

• Checks if a variable is an array

• Converts a variable to an object

• Verifies if a variable is a number

• Determines if a variable is a string

How do you access a property named age of an object named person?

• person[age]
• person.get('age')
• person.age
• person->age

9. How do you add a new property named email with the value "[e-mail]" to an object?

• object.email = '[e-mail]';
• object.email = '[e-mail]';
• object.email = '[e-mail]';
• object.email = '[e-mail]';