// DEFINE YOUR FUNCTION BELOW: function lastElement(arr){ if (arr.length === 0 ){ return null //to get the wanted arr's index number }else return arr[arr.length-1] } lastElement([3,5,7]) lastElement([1]) lastElement([0])
// DEFINE YOUR FUNCTION BELOW: function lastElement(arr){ if (arr.length === 0 ){ return null //to get the wanted arr's index number }else return arr[arr.length-1] } lastElement([3,5,7]) lastElement([1]) lastElement([0])