two dimensional array horizontal average output

Question

I am stuck with a problem and i don\'t know how to put this in a for loop. I need the hotizontal average of the next matrix:

1 2 3 4 5

5 4 3 2 1

3 2 1 4 5
         


        

Answer 1

This piece of code alerts the data structured in a table-like string.

var dArray = [[1, 2, 3, 4, 5], [5, 4, 3, 2, 1], [3, 2, 1, 4, 5]];

var str = '';
dArray.forEach(function(arr, index){ 
  var average = arr.reduce(function(sum, item){ return sum + item; })/arr.length;
  str += '\n Array ' + index + ':  ' + arr.join(' ') + '   average: ' + average;
});
alert(str);