تابع مقایسه رشته فارسی با رعایت ترتیب الفبایی حروف.

persian-alphabetic-comparator.js

function persian_alphabetic_compare(s1, s2) {
    const persian_alphabet_fix_map = {
        'ؤ': 1608.5,
        'ئ': 1609.5,
        'پ': 1577,
        'ة': 1607.5,
        'ژ': 1586.5,
        'ک': 1603,
        'چ': 1580.5,
        'گ': 1603.5,
        'ی': 1610
    }

    function compare_char_at_index(i) {
        if (i >= s1.length && i >= s2.length) return 0;
        if (i >= s1.length) return -1;
        if (i >= s2.length) return 1;

        const cmp_value =
            (persian_alphabet_fix_map[s1[i]] || s1.charCodeAt(i)) -
            (persian_alphabet_fix_map[s2[i]] || s2.charCodeAt(i));
        
        if (!cmp_value) return compare_char_at_index(i + 1);

        return cmp_value;
    }

    return compare_char_at_index(0);
}

sample.js

['پاوه', 'تهران', 'بهشهر', 'گرگان', 'کرمانشاه', 'کردکوی', 'یاسوج', 'اهواز'].sort(persian_alphabetic_compare);
// => ["اهواز", "بهشهر", "پاوه", "تهران", "کردکوی", "کرمانشاه", "گرگان", "یاسوج"]

todo.md

• Ignore special characters like Arabic diacritics, ZWNJ, RTL & LTR marks, etc.
• Ignore difference between Arabic and Persian number sets.
• Add a test suite.
• What to do with 0x06C0 (Arabic letter Heh with Yeh above)?

There's a NPM package for this function now with improved functionality.

https://www.npmjs.com/package/persian-alphabetic-compare