... is the spread operator. https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_syntax

Use Objects and sort them

You can print the random tests using

System.out.println 

Please don't post your solutions in discourse section. There's a solutions page where they can be discussed, or you can use a link to your solution.

m += t probably didn't work, because you didn't have the line var m = 0, as @rowcased explained.

Also, if you DO want to post a code snippet (when asking for help or whatever), use proper formatting for code blocks, links, etc...

you can't use += while initiating m, so the second thing doesn't really work either, you just get NaN. did it really work for you?