The median

Problem

The average chases the extremes: one huge salary pulls it up.

The median doesn't: it's the value right in the middle once you line the numbers up from smallest to largest.

Write a function that takes a list of numbers and returns its median. With 3 numbers the median is the second one; with 5, the third one.

When the count is even there isn't a single one in the middle, so the median is the average of the middle two: with 1, 2, 3 and 4 it's 2.5. The list can arrive out of order, and it can bring repeated or negative numbers. With an empty list you return 0.

Examples

• Three out of order

  [5, 1, 3] → 3

• An even count

  [1, 2, 3, 4] → 2.5

• Four out of order

  [7, 2, 9, 4] → 5.5

• With two digits

  [2, 10, 9] → 9

Besides these, the challenge has hidden tests that are revealed when you submit your solution.

You start with this

def median(numbers):
    pass

function median(numbers) {
}