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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.
   

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