Javascript Basics

Which of the following is NOT a primitive data type in JavaScript?

• String

• Boolean

• Array

• Number

What keyword is used to declare a variable in JavaScript?

• var

• let

• const

• All of the above

What will the following code output?

console.log(5 + "5");

• 55

• 10

• "55"

• Error

How would you access the 3rd element in an array named myArray?

• myArray(2)

• myArray[2]

• myArray(3)

• myArray.3

Which function is used to parse a string into an integer in JavaScript?

• parseInt()

• stringToInt()

• parseInteger()

• toInteger()

What does the `===` operator do in JavaScript?

• Checks for equality, but not type

• Checks for equality, including type

• Assigns a value to a variable

• Compares two values, ignoring type

What will the following code snippet output?

console.log(3 + 2 + "7");

• "57"

• "327"

• "12"

• Error

What is the result of the following comparison?

"10" == 10

• true

• false

• Error

• undefined

How can you check the length of an array called `myArray` in JavaScript?

• myArray.length()

• myArray.size

• myArray.length

• length(myArray)

Which of the following is NOT a valid way to declare a string in JavaScript?

• let myString = "Hello";

• let myString = 'Hello';

• let myString = "Hello';