myArray.js

const oneArray=[1,2,3,4]
const twoArray=[5,6,7,8]

//const threeArray=oneArray.concat(twoArray)// add elements of both array to third array
//console.log(threeArray)


//if we do
//const threeArray=[oneArray,twoArray]
//console.log(threeArray)//prints alag alag array separated with comma

//Another method
//spread operator
const threeArray=[...oneArray,...twoArray]
console.log(threeArray)// prints the same result as concat

//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
//now to convert object into arrays
// 
 function manyArguments(){
   let args=Array.from(arguments)//argumnets is a reserved iteratable object 
     finalArr=args.map(e=>e*2)//and Array.from() is a method to convert objects into array
    console.log(finalArr)
}
manyArguments(1,2,3,4)

//Rest operator

function manyArgumentsv2(...args){
    let finalArr=args.map(e=>e)
    console.log(finalArr)
    console.log(typeof args)// output will be object
}
manyArgumentsv2(1,2,3,4)