.reduce() func

 const newNumbers = [1, 3, 5, 7];

const newSum = newNumbers.reduce((accumulator,currentValue) =>
  {
      console.log('The value of accumulator: ', accumulator);
      console.log('The value of currentValue: ', currentValue);
      return currentValue+ accumulator;
//second arg
},10);

console.log(newSum);