// Array :- It is collection more the single value inside an variable // flat(): this method flatten the array into an new array // const newArr = Arr.flat(take the depth as argument) const arr1=["a","b",[3,5,6,"b",["h",78]]]; const flatArray =arr1.flat();//if we not given the depth it will only flatten the array upto depth 1 const flatArray2 =arr1.flat(4);//even if we given the greater number than depth it will not give an error console.log(flatArray); console.log(flatArray2); console.log(arr1);//it uses the deep copies so not chaanges the original array // INSTRUCTION //the output you are seeing is not correct please copy the code and run that //code into an another compiler other than this.