• JavaScript reference corrected
• fixed tests for length added

I'll leave a label for myself - this is an interesting solution))

Yes.

You're talking about javascript, right?

One of the criteria is "More than 3 characters but less than 20". Which means 4 to 19 characters. But in tests we see check "<=20".

Yes, RESET helps. Big Thanks for you! I never yet meets with this error...

Click reset, you probably edited the sample test. It should be like this:

Test.assertSimilar(count(['a', 'a', 'b', 'b', 'b']), { 'a': 2, 'b': 3 })

Can anybody test the task:
We have in introduce "Write a function that takes an array..." and the test which has not an array, but something this ( , { 'a': 2, 'b': 3 })
And as result test ends with next error:
"/home/codewarrior/index.js:15
Test.assertSimilar( , { 'a': 2, 'b': 3 });
......................................^
SyntaxError: Unexpected token ,
at createScript (vm.js:80:10)..."
Even if all my code is "return array;" i see the same error...

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you cannot

I can't find how i can delete this solution...

For what you wrote your solution here?