That's a way more elegant method of checking the characters than I did - thanks for teaching me something new!

I like this solution! :D

Wow thank you. I have no idea how but it works now!

You did not consider the way back home in the price and you also calculate the price of a full tank when distance is 0. What if distance is 0 but there is still gas in the tank? ;-)

I tried changing it to multiply distance by 2 (in order to account for the way back) but then it fails even more of the tests!

If you want to console.log before an error occurs yoou should console.log. . . before this error may happen.
I put a line in your code :

for(var i in result)
{
console.log(`result: ${result}, result[i]: ${result[i]}, typeof result[i]:${typeof result[i]}`)  // <-- here is my line !
  result[i].reverse();
  result[i] = result[i].join(' ');
}

. . . and got this log :

 Add (chaining) 2 players
Log
result: Ada: 44,,,Bob,88,Clo,10, result[i]: Ada: 44, typeof result[i]: string

When you try to use .reverse (an array method) on Ada: 44 (a string) an error happens !

Don't give up poor po !

; ) )

PS: nice new nick name !

how do i delete a comment?

In random cases :

• a new HallOfFame is created with size and players arguments. eg xxx = new HallOfFame(3,[["ZZ",12],["xxx",9],["YyY",13]])
  Then size of its length is tested (should be equal to 'size' )
• then a list of players is added on after another, and each time a new player is added, the list of the tested Hall is compared to expected list
  (ie list of same size but with only avaible players, sorted as required)

Does it help ?

; ) )