anynum

Normalize Unicode decimal digits and minus signs to ASCII.

Converts digits from any script — Devanagari, Arabic-Indic, Thai, Bengali, Fullwidth, and 50+ others — to their ASCII equivalents (0–9). Also normalizes Unicode minus variants (−, －, ﹣) to ASCII -.

Pairs naturally with strnum — use anynum to normalize first, then strnum to detect the numeric type.

import anynum from 'anynum';

anynum('१२.३४')     // → '12.34'   (Devanagari)
anynum('٣٫١٤')     // → '3.14'    (Arabic-Indic)
anynum('−४२')      // → '-42'     (Unicode minus + Devanagari)
anynum('－９９.５') // → '-99.5'   (Fullwidth minus + Fullwidth digits)
anynum('hello')    // → 'hello'   (no digits — zero allocation)
anynum('100')      // → '100'     (already ASCII — zero allocation)

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Install

npm install anynum

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Usage

// ESM
import anynum from 'anynum';
import { anynum } from 'anynum';

API

anynum(str: string): string

• Accepts a string, returns a string.
• Non-string values are returned as-is (no throw).
• Non-digit characters pass through unchanged.
• If no conversion is needed, the original string is returned (zero allocation).

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What gets converted

Decimal digits

Any Unicode character in category Nd (decimal digit) is mapped to its ASCII equivalent. This covers all positional decimal digit scripts — every script whose digits represent 0–9 by position.

anynum('๑๒๓')   // Thai        → '123'
anynum('੧੨੩')   // Gurmukhi   → '123'
anynum('᠑᠒᠓')   // Mongolian  → '123'
anynum('𝟏𝟐𝟑')   // Math Bold  → '123'

Unicode minus variants

Three Unicode characters are normalized to ASCII - (U+002D):

Code point	Character	Name
U+2212	−	MINUS SIGN (mathematical)
U+FF0D	－	FULLWIDTH HYPHEN-MINUS
U+FE63	﹣	SMALL HYPHEN-MINUS

Dashes used for punctuation — EN DASH (–), EM DASH (—), HYPHEN (‐) — are intentionally not converted.

anynum('−42')   // U+2212 MINUS SIGN      → '-42'
anynum('－42')  // U+FF0D FULLWIDTH        → '-42'
anynum('–42')   // U+2013 EN DASH          → '–42'  (unchanged)

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Use with strnum

anynum and strnum compose cleanly:

import anynum from 'anynum';
import strnum from 'strnum';

strnum(anynum('१२.३४'))   // → 12.34  (number, float)
strnum(anynum('−४२'))     // → '-42'  (string; strnum handles sign detection)
strnum(anynum('hello'))   // → 'hello'

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Supported scripts

50+ decimal digit scripts from Unicode Nd category, including:

Script	Zero	Sample
Devanagari (Hindi/Marathi/Nepali)	U+0966	०१२३४५६७८९
Arabic-Indic	U+0660	٠١٢٣٤٥٦٧٨٩
Extended Arabic-Indic (Urdu/Persian)	U+06F0	۰۱۲۳۴۵۶۷۸۹
Bengali	U+09E6	০১২৩৪৫৬৭৮৯
Gurmukhi	U+0A66	੦੧੨੩੪੫੬੭੮੯
Gujarati	U+0AE6	૦૧૨૩૪૫૬૭૮૯
Odia	U+0B66	୦୧୨୩୪୫୬୭୮୯
Tamil	U+0BE6	௦௧௨௩௪௫௬௭௮௯
Telugu	U+0C66	౦౧౨౩౪౫౬౭౮౯
Kannada	U+0CE6	೦೧೨೩೪೫೬೭೮೯
Malayalam	U+0D66	൦൧൨൩൪൫൬൭൮൯
Thai	U+0E50	๐๑๒๓๔๕๖๗๘๙
Lao	U+0ED0	໐໑໒໓໔໕໖໗໘໙
Tibetan	U+0F20	༠༡༢༣༤༥༦༧༨༩
Myanmar	U+1040	၀၁၂၃၄၅၆၇၈၉
Khmer	U+17E0	០១២៣៤៥៦៧៨៩
Mongolian	U+1810	᠐᠑᠒᠓᠔᠕᠖᠗᠘᠙
Fullwidth (CJK context)	U+FF10	０１２３４５６７８９
Mathematical Bold	U+1D7CE	𝟎𝟏𝟐𝟑𝟒𝟓𝟔𝟕𝟖𝟗
Adlam	U+1E950	𞥐𞥑𞥒𞥓𞥔𞥕𞥖𞥗𞥘𞥙
… and 30+ more

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What it does NOT convert

• Kanji/Chinese numeral words (三, 百, 万) — these are ideographic numerals, not decimal digits. Each language has its own positional system requiring separate parsing logic.
• Roman numerals (Ⅳ, Ⅻ) — not decimal digits.
• Punctuation dashes (– EN, — EM, ‐ HYPHEN) — not numeric signs.
• Decimal separators — commas, periods, Arabic decimal comma (٫) are passed through as-is. Separator normalization is the caller's responsibility.

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License

MIT