oh yea stupid me. thanks a lot!

i have the same issue. empty array should be filtered out in if statement but it give error
"TypeError: Reduce of empty array with no initial value at Array.reduce at sumArray"
Anyone can help? code as follow:

function sumArray(array) {
  if (!array || array.length <2 ) {
    return 0;
  } else {
   return array.sort(function (a,b) {return b-a}).slice(1,-1).reduce(function (a,b) {return a+b});
  }
}