JS Basics Quiz

What's the data type for the phoneNumber variable?

Quel est le type de données pour la variable de numéro de téléphone?

• String

• Number

What's the data type for the ageInput variable?

Quel est le type de données de la variable ageInput?

• String

• Number

What is a variable in JavaScript?

• A section of the document

• A type of JavaScript data

• A container for storing data values

• A command that performs a specific action

Which of the following is NOT a valid variable name in JavaScript?

• _myVar

• 2ndVar

• $myVar

• myVar123

How do you declare a variable in JavaScript?

• var myVariable;

• variable myVariable;

• v myVariable;

• declare myVariable;

Which of the following data types is NOT supported in JavaScript?

• String

• Number

• Character

• Boolean

What will be the output of the following code snippet? ```javascript var x = 10; var y = "20"; var z = x + y; ```

• 30

• "1020"

• "30"

• 1020

How do you create a variable with the numeric value 5?

• var x = 5;

• num x = 5;

• number x = 5;

• x = 5;

Which of the following is the correct way to define a string in JavaScript?

• var str = "Hello World";

• var str = 'Hello World';

• Both A and B

• var str = (Hello World);

What is the output of the following code snippet? ```javascript var a = true; var b = false; var c = a + b; ```

• "truefalse"

• 1

• 0

• "1false"