i18n-js/src/pluralize/ru.ts

A small library to provide I18n on JavaScript.

import { I18n } from "../I18n";
import { Pluralizer } from "../typing";

export const ru: Pluralizer = (_i18n: I18n, count: number) => {
  const mod10 = count % 10;
  const mod100 = count % 100;
  let key;

  const one = mod10 === 1 && mod100 !== 11;
  const few = [2, 3, 4].includes(mod10) && ![12, 13, 14].includes(mod100);
  const many =
    mod10 === 0 ||
    [5, 6, 7, 8, 9].includes(mod10) ||
    [11, 12, 13, 14].includes(mod100);

  if (one) {
    key = "one";
  } else if (few) {
    key = "few";
  } else if (many) {
    key = "many";
  } else {
    key = "other";
  }

  return [key];
};