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removeOrdinalSuffix

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Strip Persian ordinal endings (مین, ام, اُم, م, plus irregular forms like سوم → سه, یازدهم → یازده) from a Persian word, leaving the cardinal form. Use when canonicalizing user-typed ordinals before lookup or comparison. Triggers on mentions of removeOrdinalSuffix, strip Persian ordinal, "سوم → سه", "یازدهم → یازده", canonical Persian number word.

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Source SKILL.md: https://github.com/persian-tools/persian-tools/blob/HEAD/skills/removeOrdinalSuffix/SKILL.md

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removeOrdinalSuffix — strip Persian ordinal suffix

import { removeOrdinalSuffix } from "@persian-tools/persian-tools";
// CommonJS
const { removeOrdinalSuffix } = require("@persian-tools/persian-tools");

Public export

removeOrdinalSuffix(word: string): string

What it does

  1. Falsy input is returned as-is (no throw, no "" coercion).
  2. Generic suffixes are removed: مین, ام, اُم (note the leading space for the standalone اُم form).
  3. A table of irregular ordinals is applied (longest matches first) — e.g. سوم → سه, یکم → یک, یازدهم → یازده, دوازدهم → دوازده, etc. See src/modules/removeOrdinalSuffix/index.ts for the full list.
import { removeOrdinalSuffix } from "@persian-tools/persian-tools";

removeOrdinalSuffix("سوم");           // "سه"
removeOrdinalSuffix("یازدهم");        // "یازده"
removeOrdinalSuffix("بیستم");         // "بیست"
removeOrdinalSuffix("سیزدهمین");      // "سیزده"
removeOrdinalSuffix("سه هزارم");      // "سه هزار"
removeOrdinalSuffix("چهاردهمین");     // "چهارده"

Input rules

  • Accepts string. Does not throw on null/undefined/""; they pass through unchanged.
  • Does not normalize Arabic-typed characters (ي, ك). Run autoArabicToPersian upstream if input may originate from an Arabic keyboard, otherwise irregular-form matches will miss.

What it does NOT recognize

  • اول → یک is NOT a built-in mapping. removeOrdinalSuffix("اول") returns "اول" unchanged. The function only handles forms produced by addOrdinalSuffix plus the suffix-addition pattern; older idiomatic ordinals like اول/اولی are out of scope.
  • Latin-numeric ordinals like "1st", "3rd" are out of scope (return unchanged).

Common use case — canonicalising user input for lookup

import { removeOrdinalSuffix, wordsToNumber } from "@persian-tools/persian-tools";

const numericValue = (s: string) => wordsToNumber(removeOrdinalSuffix(s));

numericValue("سومین نفر");   // wordsToNumber("سه نفر") drops "نفر" silently → 3
numericValue("بیستم");        // wordsToNumber("بیست") → 20

References

  • Tests: test/removeOrdinalSuffix.spec.ts
  • Inverse: addOrdinalSuffix skill