I have some long strings that I need to reverse. I haven’t found a string function for this, so I wrote my own partial which is (unsurprisingly) very slow but does the job.
{{- return delimit (collections.Reverse (split . "")) "" }}
Is there a more performant way to do this?
This seems to be about 20% faster (test was 1000 iterations).
{{ $s := "" }}
{{ range split . "" }}
{{ $s = print . $s }}
{{ end }}
{{ return $s }}
But the partial call is the largest portion (~ 85%) of the total time. Can you inline the code instead?
Thanks Joe. Yes, I can inline the partial and it is a good tad (around 50%) faster. But not as much as I liked it to be.
Would it be faster if Hugo would provide a built-in function for strings?
Sorry, I didn’t mean to create an inline partial. I was wondering if you could just insert the code where needed. It may not be DRY, but it’s fast.
Regarding a template function to reverse strings… I would think it would be faster, but I’m not sure.
Also, I changed the example above to use print instead of add… it’s a bit faster.
I tried out your suggestion. It’s a game changer. Thanks a lot!
Looking at the Go issue queue, there have been a few requests for a strings.Reverse function, but all were closed due to insufficient need.
https://github.com/golang/go/issues/36887#issuecomment-591601541
It remains not needed often enough to merit inclusion in the standard library.
I reached the same conclusion, and would vote to not create a template function. The implementation is not trivial… you need to handle both composite and non-composite characters .
So… which method is faster depends on the length of the string. For a long string (e.g., a paragraph), the split/delimit approach is faster. For short strings (e.g., a word) the range/print approach is faster.
Hmm … Oh, well, I would say that collections.Reverse should support strings (which is effectively a byte slice), could you reaise a GH issue.
Done.
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