W3Schools
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JavaScript Data Types
Booleans are often used in conditional testing. ... JavaScript Objects represent complex data structures and functionalities beyond the primitive data types (string, number, boolean, null, undefined, symbol, bigint).
W3Schools
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JavaScript typeof
An empty string has both a legal value and a type. ... In JavaScript null is "nothing". It is supposed to be something that doesn't exist. Unfortunately, in JavaScript, the data type of null is an object.
Videos
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JavaScript Datatypes
HTML CSS JAVASCRIPT SQL PYTHON JAVA PHP HOW TO W3.CSS C C++ C# BOOTSTRAP REACT MYSQL JQUERY EXCEL XML DJANGO NUMPY PANDAS NODEJS DSA TYPESCRIPT ANGULAR ANGULARJS GIT POSTGRESQL MONGODB ASP AI R GO KOTLIN SWIFT SASS VUE GEN AI SCIPY CYBERSECURITY DATA SCIENCE INTRO TO PROGRAMMING BASH RUST
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Data types
We can put any type in a variable. For example, a variable can at one moment be a string and then store a number: // no error let message = "hello"; message = 123456; Programming languages that allow such things, such as JavaScript, are called “dynamically typed”, meaning that there exist data types, but variables are not bound to any of them.
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JavaScript Objects
In JavaScript, almost "everything" is an object. ... All JavaScript values, except primitives, are objects. A primitive data type is data type that can only store a single primitive value. JavaScript defines 7 types of primitive data types: ... If you want to use W3Schools services as an ...
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Exercise: - JS Data Types
Introduction3 q · Where To3 q · Output3 q · Statements3 q · Syntax3 q · Comments3 q · Variables7 q · Let3 q · Const3 q · Operators3 q · Arithmetic Operators3 q · Assignment Operators3 q · Data Types3 q · Functions5 q · Objects4 q · Object Properties3 q ·
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JavaScript Data Types
JS Examples JS HTML DOM JS HTML Input JS HTML Objects JS HTML Events JS Browser JS Quiz JS Certificate JS Summary ... String, Number, Boolean, Array, Object. JavaScript variables can hold many data types: numbers, strings, arrays, objects and more:
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JavaScript Syntax
The JavaScript syntax defines two types of values: ... JavaScript keywords are used to defines actions to be performed. ... JavaScript keywords are case-sensitive. JavaScript does not interpret LET or Let as the keyword let. Variables are containers for storing data values.
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JavaScript Variables
The let and const keywords were new to JavaScript in 2015. var x = 5; var y = 6; var z = x + y; Try it Yourself » ... JavaScript variables can hold 8 datatypes, but for now, just think of numbers and strings.
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Completed Exercise: JavaScript Data Types
I have completed the JavaScript Data Types Exercise at W3Schools.com
Mozilla
developer.mozilla.org › en-US › docs › Web › JavaScript › Guide › Data_structures
JavaScript data types and data structures - JavaScript | MDN
This article attempts to list the built-in data structures available in JavaScript and what properties they have. These can be used to build other data structures. The language overview offers a similar summary of the common data types, but with more comparisons to other languages.
GeeksforGeeks
geeksforgeeks.org › javascript › javascript-data-types
JavaScript Data Types - GeeksforGeeks
Mainly data type is stored with value (not with variable name) and is decided & checked at run time. ... 2. Everything is an Object (Sort of): In JavaScript, Functions are objects, arrays are objects, and even primitive values can behave like objects temporarily when you try to access properties on them.
Published October 5, 2025
W3Schools
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JavaScript Data Types
In the second example, since the first operand is a string, all operands are treated as strings. JavaScript has dynamic types. This means that the same variable can be used to hold different data types:
Programiz
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JavaScript Data Types (with Examples)
Data types represent the different kinds of values we can use in JavaScript. In this tutorial, you will learn about the various data types available in JavaScript with the help of examples.
Tutorial Republic
tutorialrepublic.com › javascript-tutorial › javascript-data-types.php
Understanding the JavaScript Data Types - Tutorial Republic
There are six basic data types in JavaScript which can be divided into three main categories: primitive (or primary), composite (or reference), and special data types. String, Number, and Boolean are primitive data types.
GeeksforGeeks
geeksforgeeks.org › javascript › variables-datatypes-javascript
Variables and Datatypes in JavaScript - GeeksforGeeks
Non-primitive types are objects and can store collections of data or more complex entities. ... In JavaScript, both null and undefined represent "empty" values but are distinct types. null is a special object representing the intentional absence of a value, while undefined signifies that a variable has been declared but not assigned a value.
Published February 24, 2018
BrainStation®
brainstation.io › learn › javascript › data-types
JavaScript Data Types (2025 Tutorial & Examples) | BrainStation®
February 4, 2025 - Arrays are a type of object whose keys are integers. Arrays are a key building block for complex data structures. It is important to note that JavaScript is a dynamic and weakly typed language, so the same variable can be used to hold a variety of different data types.
W3docs
w3docs.com › learn-javascript › javascript-data-types.html
JavaScript Data Types
Here, we delve into each primitive data type with examples. let age = 25; // Integer let price = 99.99; // Floating-point · Numbers in JavaScript are versatile and can represent integer, floating-point values, and special values like Infinity and NaN (Not a Number).
Top answer 1 of 5
9
You can test it using typeof operator:
The typeof operator gives you the names of data types when placed before any single operand.
Hence, try using typeof with any operand variable: it will give one of the following datatype names:
- String
- Number
- Boolean
- Object
- Undefined
Hence, these are the five data Types in Javascript.
var val1 = "New World"; //returns String
var val2 = 5; //returns Number
var val3 = true; //returns Boolean
var val4 = [1,2,3]; //returns Object
var val5 = null; //returns Object (Value is null, but type is still an object)
var val6; //returns Undefined
2 of 5
4
Things aren't actually as straightforward as they described in answers above... they usually aren't in javascriptland ;)
typeof is the 'official' function that one uses to get the type in javascript, however in certain cases it might yield some unexpected results ...
1. Strings
typeof "String" or
typeof Date(2011,01,01)
"string"
2. Numbers
typeof 42 or
typeof NaN, lol
"number"
3. Bool
typeof true (valid values true and false)
"boolean"
4. Object
typeof {} or
typeof [] or
typeof null or
typeof /aaa/ or
typeof Error()
"object"
5. Function
typeof function(){}
"function"
6. Undefined
var var1; typeof var1
"undefined"
Alternative is to use ({}).toString() which will get you somewhat more accurate answer most of the time...
W3Schools
w3schoolsua.github.io › js › js_datatypes_en.html
JavaScript Data Types. Examples. Lessons for beginners. W3Schools in English
JavaScript Data Types. The Concept of Data Types. Types are Dynamic. Strings. Numbers. Booleans. Arrays. Objects. The typeof Operator. Undefined. Empty Values. Examples. Lessons for beginners. W3Schools in English