JavaScript Data type & Structure

At first what is JavaScript?

JavaScript is programming language or specifically a scripting language which enables to create dynamically updating content, control multimedia, animated images and pretty much everything 😃
There are ten types of data types in JavaScript. They are:

• String,
• Integer,
• Float,
• Boolean,
• Undefined,
• Null,
• Object,
• Array,
• Function.
• BigInt

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String

Strings in JavaScript are sequences of Unicode characters or specifically sequences of UTF-16 code units. Strings in JavaScript declared in single quotation mark ('') or double quotation mark (""). Example:

 var string = 'ASCII text';

There is a detailed description about JavaScript string in this link: MDN JavaScript String

Integer

Integer is a number type in JavaScript. Which is a 64 bit binary format value. Like example:

var integer = 123456789;

There is a detailed description about JavaScript integer in this link: MDN JavaScript Number

Float

Float is another number type data-type in JavaScript. Float is a type of data that refers to decimal value with points. Like:

var float = 123.456;

There is a detailed description about JavaScript float in this link: MDN JavaScript Number

Boolean

Boolean is a type, with two possible values. Either true or false. Example:

var YES = new Boolean (true);

if (typeof variable === "boolean"){console.log("variable is a boolean");}`
There is a detailed description about JavaScript Boolean in this link: JavaScript Boolean

Undefined

Undefined is a variable which has been declared, but no value has been given to it .


var undef;//defaults to undefined
var undef = undefined;//not common, use null

There is a detailed description about JavaScript Undefined in this link: JavaScript Undefined

Null

Null is a value that can be assigned to a variable and represents 'no value'.


var nul = null;

There is a detailed description about JavaScript Null in this link: JavaScript Null

Object

JavaScript object is a collection of name-value pairs. Like ;


var person = {'name':'John Smith','age':27};

There is a detailed description about JavaScript Object in this link: JavaScript Object

Array

Arrays in JavaScript are actually a special type of object. It's like a regular objects declared in [] syntax. But it has one magic property which is length.


var arr = ['Hello','my','name','is','Dr.Hippo',123,null];

There is a detailed description about JavaScript Array in this link: JavaScript Array

Function

JavaScript function is a procedure. In function by taking one or more input then there will be some steps and then the output will be result.


var fun = function(){
return 42;
}

There is a detailed description about JavaScript Funtion in this link: JavaScript Function

BigInt

JavaScript BigInt is a numeric data type that can represent integers in the arbitrary precision format.


var alsoHuge = BigInt(9007199254740991); // 9007199254740991n

There is a detailed description about JavaScript BigInt in this link: JavaScript BigInt

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So, these are some of the JavaScript data types and their details.