Javascript:Build nexted array from given array

 

From given array [1,2,3,4,5] build nexted array [1,[2,[3,[4,[5]]]]]

Code:

    let arr=[1,2,3,4,5]

    function buildNextedArray(arr){

    for(let i=0;i<arr.length;i++){

        if(arr.length==1){

            return [arr[i]]

        }else{

            let newArr = arr.slice(1)

            return [arr[i],buildNextedArray(newArr)]

        }

    }

    }

    let result = buildNextedArray(arr);

    console.log(JSON.stringify(result));

Output:

    [1,[2,[3,[4,[5]]]]]