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Editorial Team
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Asked: 2026-06-08T03:43:36+00:00

I need to get the highest possible UTF8 character for a prefix search. I

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I need to get the highest possible UTF8 character for a prefix search.

I have a data set like this:

A
Ba
Bf
C

Now I can do a prefix search by specifying start and end values:

Start: B
End: B* where * should be the highest possible UTF8 character.

How can I get this programatically using Javascript?

Edit: Here is a better example:

I need to send this prefix to a JSON RPC API. So I can’t do the actual comparison in JS.

But if I wanted to mach both strings starting with B, I would send 

Start: B 
End: B?

where ? is the biggest possible UTF8 character.

If it was ASCII, I could do "B" + String.fromCharCode(255), but this is just for ASCII. My strings are in UTF8, in which case this wouldn’t match all possible strings starting with B.

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1 Answer

  1. Editorial Team

    If you want to make a range, you can use \uffff.

    MyRange("foo", "foo\uffff")

    Will find everything that starts with foo.

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