JavaScript Data Types

Great job on starting a new lesson! In the FAQ, test yourself by clicking the correct answer for each question. Then, click Next button at bottom right to continue.

JavaScript Data Types

JavaScript has seven data types, which represent different kinds of values. JavaScript variables can store values of these data types.

What are the 7 data types in JavaScript?

These data types include strings, numbers, booleans, arrays, objects, null, and undefined. Each data type serves a specific purpose and has its own characteristics.

JavaScript Example: Data Types

// JavaScript data types examples
var name = 'Jack'; // string data type
var age = 32; // number data type
var isStudent = true; // boolean data type
var numbers = [1, 2, 10, 3]; // array data type
var person = { name: 'John', age: 25 }; // object data type
var emptyValue = null; // null data type
var undefinedValue = undefined; // undefined data type
document.write(name + ' ');
document.write(age + ' ');
document.write(isStudent + ' ');
document.write(numbers + ' ');
document.write(person + ' ');
document.write(emptyValue + ' ');
document.write(undefinedValue + ' ');

FAQ (Interview Questions and Answers)

1. How many data types are there in JavaScript?
   Seven
   Five
   Ten
   
2. What is the data type used to represent a group of values in JavaScript?
   String
   Number
   Array
   
3. Which data type represents the absence of a value in JavaScript?
   number
   boolean
   null
   
4. What data type is assigned to a variable that has been declared but not assigned a value?
   string
   number
   undefined
   
5. Can a JavaScript variable store multiple data types?
   No, a variable can only hold one data type.
   Yes, a variable can hold different data types.
   Yes, but only if it's declared as an object.
   

Your Total Score: 0 out of 5

Remember to just comment if you have any doubts or queries.

Where to learn JavaScript? Take the JavaScript course free in Software Testing Space.