How to compare Unicode strings in Javascript?

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You can use Intl.Collator or String.prototype.localeCompare, introduced by ECMAScript Internationalization API:

"Ł".localeCompare("Z", "pl");              // -1
new Intl.Collator("pl").compare("Ł","Z");  // -1

-1 means that Ł comes before Z, like you want.

Note it only works on latest browsers, though.

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