Array Function 2 In Javascript

 let prompt = require("prompt-sync")();

let alert = require("prompt-sync")({ sigint: true });

let num = [71, 52, 63, 44, 75, 84]

let num1 = [71, 52, 63, 44, 75, 84]

let newa = num.concat(num1)

console.log(newa)

num.sort()

console.log(num)

let compare = (a, b) => {

  return b - a

}

num.sort(compare)

console.log(num)

//Spile and slice

let n = [71, 52, 63, 44, 75, 84]

n.splice(2, 3, 1021, 1022, 1023)

console.log(n)

let snum = n.slice(1,3)

console.log(snum)