Data Types
Javascript is a dynamically typed language and hence though there are data types, variables are not bound to them. In short, a variable can hold any type of data. Same variable can be a number or string or boolean or any other value. Javascript will not throw any error even if you assign a string value to integer variable.
There are 8 different types of data types present in Javascript.
1. Number
Number datatype represents both integers and floating values. Also, it represents Infinity and NaN values as well.
Example
2. String
String datatype represents text or you can say series of characters. You can use double quotes (" ") or single quotes (' ') or back ticks (``) to represent strings.
Example
3. BigInt
BigInt datatype is used to represent arbitrary length integers as there is a technical limitation for number datatype that it can not represent larger than 9,007,199,254,740,992.
Example
4. Null
Null is a special value which is used to represent nothing or no value or unknown value.
Example
5. Undefined
Undefined is also a special value which is used to represent value is not assigned. This is predominantly used to check if a variable is assigned or not.
Example
6. Boolean
Boolean datatype represents boolean values: true or false.
Example
7. Symbol
Symbol is a primitive data type introduced in ES6 that represents a unique identifier. Each Symbol value is unique and cannot be recreated.
Example
8. Object
All the above seven datatypes are called primitive datatypes as they contain some value. Object datatype represents complex entities which consists of key-value pairs. Objects can be created using curly brackets({ }).
Example
Let's us see in-detail about Objects in further topics.
Summary
| Data Type | Description |
|---|---|
| number | Represents numbers like integers, floating-values etc |
| string | represents one or more characters |
| bigint | represents integers of arbitrary length |
| null | represents unknown values |
| undefined | represents undefined values |
| object | represents complex data structures |
| boolean | represents either true or false |
| symbol | represents unique identifiers |