React JS Essentials

 React JS Smart Notes of Every Topics

React JS Essential:

--immutable vs mutable

var arr[] =[1,2,3,4]

var arr2=arr

arr2.pop();   //  arr2 value 1 2 3  but arr is also 1 2 3 its a problem in reference data type

in react js there is a state which cannot be mutate( not change value directly)

var state = [1,2,3]

state.pop()  // that is not allowed

--Array Objects Destructuring import and export

-- map filter arrow functions (implicit returns)

--

Array is a data structure who store more than one elements of every kind.

var arr=[]