spreadsyntax.js

//Spread Syntax : 
//The spread syntax allows an iterable (like arrays and strings) to be expanded in places where zero or more arguments are expected.

// Math.max can't be applied to the arr array because it doesn't take an array as an argument, it takes the individual elements as arguments. The spread operator ... is used to pull the individual elements out the array.

const arr = [4, 6, -1, 3, 10, 4];
const max = Math.max(...arr);//... is spread syntax
console.log(max);

////How to copy a reference value
var a=[1,2,3,4,5];
var b=a;// bis not an another array , it just refer to the array a[]
b.pop();// it pops from the original (reference ) array a[]
console.log(b);//[1,2,3,4]
console.log(a);//[1,2,3,4]
//But we can copy a reference value without changing the reference variable using spread operator
var a=[1,2,3,4,5];
var b=[...a];// b[] is an another array and  it just copy all the individual elements from array a[]  by spread operator
b.pop();// it pops from the copied array which is b[]
console.log(b);//[1,2,3,4]
console.log(a);//[1,2,3,4,5]

//Similarly we can copy from object
var obj ={name: "Kirtti", age: 24};
var newobj = {...obj};
console.log(obj);
console.log(newobj);
newobj.age+=1;
console.log(newobj);
console.log(obj);