const arr = [[5], 3, [1], 4, [2]];

// sort with bubble sort

for (let i = 0; i < arr.length; i++)

for (let j = 0; j < arr.length - i - 1; j++)

let jNum =

(arr[j]) ? arr[j][0] : arr[j];

let j1Num =

(arr[j + 1])

? arr[j + 1][0]

: arr[j + 1];

if (jNum > j1Num)

[

,

] = [arr[j + 1], arr[j]];

}

}

}