Kata_js_sum_without_highest_and_lowest_number.js

// https://www.codewars.com/kata/576b93db1129fcf2200001e6/train/javascript

function sumArray(array) {
  // --- simple output controls
  if(!array) return 0 ;
  if(array && Object.keys(array).length <=2) return 0;

  // -- find the maximum and the minimum
  const max = Math.max(...array);
  const min = Math.min(...array);

  // -- delete the maximum and the minimum  
  let index = array.indexOf(max);
  array.splice(index, 1); 
  index = array.indexOf(min);
  array.splice(index, 1); 

  // -- sum 
  return array.reduce((a, b) => a + b, 0)
}

console.log( sumArray(null)                     , 0 );
console.log( sumArray([ ])                      , 0 );
console.log( sumArray([ 3 ])                    , 0 );
console.log( sumArray([ 3, 5 ])                 , 0 );
console.log( sumArray([ 6, 2, 1, 8, 10 ])       , 16 );
console.log( sumArray([ 0, 1, 6, 10, 10 ])      , 17 );
console.log( sumArray([ -6, -20, -1, -10, -12 ]), -28);
console.log( sumArray([ -6, 20, -1, 10, -12 ])  , 3 );