bhaveshdaswani93

let mutateObj = {
  first_name:'lorem',
  last_name:'ipsum'
};

let immutateObj = {
  first_name:'irum',
  last_name:'egestas'
};

bhaveshdaswani93

//Imperative: what to do and how to do
//Declarative: what to do and what should be done

// Task i want to loop through 1 to 5 and print in the console let see how we can do the code impertively as well as declaratively

//Imerative
for(i=1;i<=5;i++) {
  console.log(i);
}
/*

bhaveshdaswani93

//here i will try to explain a key concept idempotence with example
function notIdempotenceFn(num) {
  return Math.random(num);
}

notIdempotenceFn(5);
notIdempotenceFn(5);
// the output of above two function will be differeht however passing the same input so the function is not idempotent

function idempotentFn(num) {

bhaveshdaswani93

let a = (num1,num2) => {
  return num1+num2;
}

let b = (num) => {
  return num*2;
}

console.log(b(a(3,4))) //output will be 14
// here i can replace a(3,4) expression with value 7 value and this will not effect to the result of the program because its return

bhaveshdaswani93

function addTwoNumber(num1,num2) {
  return num1 + num2;
}

addTwoNmber(3,4); // will return 7 no matter how many times is called

function multiplyWithCurrentTime(num) {
  return num * new Date().getTime();
}

bhaveshdaswani93

// In this example i want to clear out the difference between function with side effect and a function without side effect
let arr = [1,2,3];
function removeLastItem(input) {
  input.pop();
}

removeLastItem(arr); 
console.log(arr); // output [1,2] (this function changes the orignal variable from [1,2,3] -> [1,2])
// above execution has side effect as it mutate arr which belong to the outside world.

bhaveshdaswani93

class Person 
{
  constructor(first_name,last_name) {
    this.first_name = first_name;
    this.last_name = last_name;
  }
 getFullName() {
  return `Full Name is: ${this.first_name} ${this.last_name}`;
 }
}

bhaveshdaswani93

let person = {
  first_name:'lorem',
  last_name:'ipsum',
  getFullName(){
    return `Fullname is ${this.first_name} ${this.last_name}`;
  }
}

let personA = Object.create(person);
personA.first_name = 'ullamcorper'; //overwrite the person first_name property

bhaveshdaswani93

let Person = function(first_name,last_name) {
      this.first_name = first_name;
      this.last_name = last_name;
  }
Person.prototype.getFullName = function() {
  return `Full Name is: ${this.first_name} ${this.last_name}`;
}

let personA = new Person('lorem','ipsum');
let personB = new Person('felis','ullamcorper');

bhaveshdaswani93

let personA = {
  first_name: "lorem",
  last_name: "ipsum",
  getFullName() {
    return `Full Name is: ${this.first_name} ${this.last_name}`;
  }
};

let personB = {
    first_name: "rutrum",