Playing around with datatypes in JS

One of the most important component of a programming language is its datatypes. They can be looked upon as a building block of any programming language. In this article we will play around with datatypes in JS and explore more about it!
In JavaScript one of the most interesting feature about variables is that , they are not particularly assosiated with any specific value type and they can assigned and reassigned a value any time.That is why is said that JS is a loosely typed and dynamic language.

There are primarily two types in JavaScript:-
1.Primitives
2.Objects

Primitives
Primitives are immutable.There are 7 different Primitives
1.Boolean
2.Null
3.Undefined
4.Number
5.BigInt
6.String
7.Symbol

Objects
Objects are nothing but collection of data in form of key value pairs.

typeof operator
The typeof operator helps us to find the type of any unevaluated operand. For eg,

Function and arrays are also objects in JavaScript!

BigInt
BigInt is a datatype which deals with operations on huge value of integer numbers. BigInt allows to work with numbers beyond the limit of Number primitive.
BigInt is represented by suffix n.

Note: It is not possible to perform operations on number datatype and bigInt.

Often while writting programs we need to convert data from one form to another. Here are few conversion methods.
1. Number to String
There are 3 ways to convert a number to string
consider, const no=10;

String(no)
no.toString()
no+""

2.String to Number
There are 3 ways to convert a string to number
consider, const str='10';
1.Number(str);
2.+str
3.parseInt(str)

Common Methods on Number object

Number.isInteger(3.5);            //false
Number.parseInt('5.8');           //5
Number.parseFloat('5.86');        //5.86
Number.isNaN(NaN);                //true
Number.isNaN('text');             //false
10.567.toFixed(2)                 //10.57
10.567.toPrecision('3');          //10.6

NaN
NaN is a special type of number which results by invalid mathematical operations. For eg subtracting a string and number.

Number.isNaN('text'-10)        //true

Methods on Math object.

Math.abs(-5);                 //5
Math.floor(1.6)               //1
Math.ceil(3.5)                //4
Math.round(3.67)              //4
Math.max(-5,3,8)              //8
Math.min(-5,3,8)              //-5
Math.sqrt(64)                 //8
Math.pow(5,3)                 //125
Math.trunc(-6.3)              //-6

Symbol
Symbol represents a unique identifier.Symbols are used to identify object properties and to add unique property keys to an object.