The largest in the list

Problem

Write a function that takes a list of numbers and returns the largest one. Walk through the list and keep the biggest one you have seen so far.

The numbers can be negative. If the list is empty there is no largest one: in that case you return 0.

Examples

• [3, 9, 4] → 9

• [10, 3, 1] → 10

• [7] → 7

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

You start with this

def largest_in_list(numbers):
    pass

function largestInList(numbers) {
}