Largest of four numbers

Question

This is a free code camp challenge.

Return an array consisting of the largest number from each provided sub-array.

example:
largestOfFour([[13, 27, 18, 26], [4, 5, 1, 3], [32, 35, 37, 39], [1000, 1001, 857, 1]]) should return [27, 5, 39, 1001].

can someone explain what is wrong with my algorithm?
https://code.sololearn.com/W76V8owgmW54/?ref=app

Answer 1

visph thank you, ot works. Buy O don't really understand the sort callback function

Answer 2

js array sort method default to alphanumeric sort... you must provide a sort callback to compare values as numbers:

ele = ele.sort((a,b) => a-b);

Answer 3

comparison function should receive two array items as argument, and expect a numeric value to be returned (negative i a < b, 0 if a == b, positive if a > b):

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/sort