Remove diacritics

diacritics.js

/**
 * Remove diacritics (accent and other marks) on characters, and dissociate double characters.
 * Based on the character map of http://lehelk.com/2011/05/06/script-to-remove-diacritics/
 * but per-character walk (improved performance).
 * 
 * Licensed under WTFPL v2 http://sam.zoy.org/wtfpl/COPYING
 */

var removeDiacritics = (function() {
	var diacritics = 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	return function (str) {
		var chars = str.split(''),
		    i = chars.length - 1,
		    alter = false,
		    ch;
		for (; i >= 0; i--) {
			ch = chars[i];
			if (diacritics.hasOwnProperty(ch)) {
				chars[i] =  diacritics[ch];
				alter = true;
			}
		}
		if (alter) {
			str = chars.join('');
		}
		return str;
	}
})();

Removed No-Op entries like "\u0041":"A",

Performance tests: http://jsperf.com/remove-diacritics/2

Fixed some incorrect entries:

• ſ is s, not l
• ß and ẞ are respectively ss and SS instead of single s

Added digit entries:

• ⁰₀０⓪ to 0
• ¹₁１⒈⑴❶⓵① to 1
• ²₂２⒉⑵❷⓶② to 2
• ³₃３⒊⑶❸⓷③ to 3
• ⁴₄４⒋⑷❹⓸④ to 4
• ⁵₅５⒌⑸❺⓹⑤ to 5
• ⁶₆６⒍⑹❻⓺⑥ to 6
• ⁷₇７⒎⑺❼⓻⑦ to 7
• ⁸₈８⒏⑻❽⓼⑧ to 8
• ⁹₉９⒐⑼❾⓽⑨ to 9

An (approximately) equivalent Scala implementation from REL uses a combination of Unicode Canonical Decomposition (that vanilla JavaScript can't do AFAIK) and a translation map for other characters.