I don't know what that means. Have you read the description?

arrange them such that they form the biggest number

when you say "why", are you suggesting there's an order that forms a higher number? if so, what order is that?

you're not asked to sort the numbers if that's what you mean. that seems to be what you're saying.

Also, your code fails for cases like

[ [ -3, -9, 8, 7, -9, 7, 4, 7, 1 ],
  [Function: trueIfValueEqualsIndex] ]

Because your founded will store 7, but you output the 1st occurence or index (position) of that value, in which the correct result should be 7 (index) instead of 3 (first occurence of the value 7)

If n is greater than the length of values, you should return the sum of the whole array. That's not what you are doing there :

if(n > values.length){
        return values.length
      }

                                    vv
expected '65 119esi 111dl 111lw 108devi 105n 97n 111ka' 
to equal '65 119esi 111dl 111lw 108dvei 105n 97n 111ka'
                                    ^^ 

There

I haven't yet unlocked this kata so I can't see test cases, but thinking logically:

this example is using a function called trueIfLengthEqualsIndex - in other words it will return True if the element in the array has the same length as its index.

Working through the example array given - write down the length of each element and its index:

The input array ["one","two","three","four","five","six"]

therefore gives - where e.g. len("three")=5 :

[ index 0 len=3, index 1 len=3, index 2 len=5, index 3 len=4, >>>> index 4 len=4 <<<< , index 5 len=3]

so I would expect 4 to be the correct result here.