June 22, 2023

JavaScript Data Types

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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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