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You're welcome. :-)

oh yea stupid me. thanks a lot!

Try "if (array == null)"
and "array.length < 3"!!!

An array of 2 without the highest and the lowest element has 0 elements! And so reduce cannot work!

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});
  }
}