W3Schools
w3schools.com › js › js_datatypes.asp
JavaScript Data Types
Without data types, a computer cannot safely solve this: ... Does it make any sense to add "Volvo" to sixteen? Will it produce an error or will it produce a result? ... When adding a number and a string, JavaScript will treat the number as a string.
W3Schools
w3schools.com › js › js_types.asp
JavaScript Datatypes
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Videos
W3Schools
w3schools.com › js › js_typeof.asp
JavaScript typeof
The typeof operator returns the data type of a JavaScript variable.
W3Schools
w3schools.com › js › exercise.asp
Exercise: - JS Data Types
Data Types3 q · Functions5 q · Objects4 q · Object Properties3 q · Object Methods3 q · Display Objects3 q · Object Constructors3 q · Events3 q · Strings4 q · String Methods5 q · String Search4 q · String Templates3 q · Numbers3 q · BigInt3 q · Number Methods3 q ·
W3Schools
w3schools.com › js › js_datatypes_primitives.asp
JavaScript Primitive Data Types
A JavaScript variable can hold 8 types of data.
W3Schools
w3schools.com › js › exercises › datatypes.htm
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.
Cach3
w3schools.com.cach3.com › js › js_datatypes.asp.html
JavaScript Data Types - W3Schools
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W3Schools Blog
w3schools.blog › home › javascript data types and variable scope
Javascript Data Types and Variable Scope - W3schools
December 30, 2015 - Javascript data types list and variable scope example : JavaScript Data Types are the type of values that can be represented and manipulated by JavaScript.
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
W3Schools
w3schools.com › js › js_variables.asp
JavaScript Variables
Variables are containers for storing data. Variables are identified with unique names called identifiers. Names can be short like x, y, z. Names can be descriptive age, sum, carName. The rules for constructing names (identifiers) are: Names can contain letters, digits, underscores, and dollar signs. Names must begin with a letter, a $ sign or an underscore (_). Names are case sensitive (X is different from x). Reserved words (JavaScript keywords) cannot be used as names.
W3Schools
w3schools.com › js › js_json_datatypes.asp
JSON Data Types
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W3docs
w3docs.com › learn-javascript › javascript-data-types.html
JavaScript Data Types
Understanding these types is crucial for effective programming in JavaScript. Numbers: Integral or floating-point values. JavaScript handles various operations like addition, subtraction, and more. String: Represents textual data.
JavaScript.info
javascript.info › tutorial › the javascript language › javascript fundamentals
Data types
The number type represents both integer and floating point numbers. There are many operations for numbers, e.g. multiplication *, division /, addition +, subtraction -, and so on. Besides regular numbers, there are so-called “special numeric values” which also belong to this data type: Infinity, -Infinity and NaN.
W3Schools
w3schools.com › js › js_type_conversion.asp
JavaScript Type Conversions
When JavaScript tries to operate on a "wrong" data type, it will try to convert the value to a "right" type.
W3Schools
w3schools.com › js › js_syntax.asp
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.
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...
Programiz
programiz.com › javascript › data-types
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.
W3Schools
w3schools.com › whatis › whatis_js.asp
What is JavaScript
You have already learned that JavaScript variables are containers for data values. This code assigns a simple value (Fiat) to a variable named car: ... Objects are variables too. But objects can contain many values. This code assigns many values (Fiat, 500, white) to a variable named car: var car = {type:"Fiat", model:"500", color:"white"}; Try it Yourself »
W3Schools
w3schools.com › js › js_datatypes_objects.asp
JavaScript Built-In Objects
JavaScript Objects represent complex data structures and functionalities beyond the primitive data types (string, number, boolean, null, undefined, symbol, bigint).