added buffer to concatenate

[fabiogermann]

instead of string concatenation (string concatenation will allocate new memory for every change of the string and sometimes cause a memory overflow).

[inorganik]

Hi, thanks for contributing! I would like to merge, however it looks like you didn't test your code. When you don't pass an argument to join(), it separates with a comma. So you need to change it to an empty string: join(''). But that's not all. It's also ignoring nested objects.

If you can fix these things and thoroughly test before you commit, I can merge.

Thanks, Jamie

[fabiogermann]

sure. i'll have time this weekend

[fabiogermann]

I pushed an updated version. the previous errors have been corrected. However I thought about adding a "newline" in case of nested arrays after the child array was closed. in your original code that would be line 225

[inorganik]

sorry, let this one sit too long and it got outdated.