pluralize() — react Function Reference

Architecture documentation for the pluralize() function in utils.js from the react codebase.

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BabelCompiler→ Validation→ pluralize() — react Function Reference

Dependency Diagram

graph TD
  32c9cded_7802_2453_63ff_40e62addad6e["pluralize()"]
  d7b27d30_728f_ba37_ed97_d371fbd3de62["utils.js"]
  32c9cded_7802_2453_63ff_40e62addad6e -->|defined in| d7b27d30_728f_ba37_ed97_d371fbd3de62
  1a0ee4d1_83f7_0dc1_4412_fcab95a7984d["SuspendedByGroup()"]
  1a0ee4d1_83f7_0dc1_4412_fcab95a7984d -->|calls| 32c9cded_7802_2453_63ff_40e62addad6e
  style 32c9cded_7802_2453_63ff_40e62addad6e fill:#6366f1,stroke:#818cf8,color:#fff

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Source Code

packages/react-devtools-shared/src/devtools/views/utils.js lines 202–257

export function pluralize(word: string): string {
  if (!/^[a-z]+$/i.test(word)) {
    // If it's not a single a-z word, give up.
    return word;
  }

  // Bail out if it's already plural.
  switch (word) {
    case 'men':
    case 'women':
    case 'children':
    case 'feet':
    case 'teeth':
    case 'mice':
    case 'people':
      return word;
  }

  if (
    /(ches|shes|ses|xes|zes)$/i.test(word) ||
    /[^s]ies$/i.test(word) ||
    /ves$/i.test(word) ||
    /[^s]s$/i.test(word)
  ) {
    return word;
  }

  switch (word) {
    case 'man':
      return 'men';
    case 'woman':
      return 'women';
    case 'child':
      return 'children';
    case 'foot':
      return 'feet';
    case 'tooth':
      return 'teeth';
    case 'mouse':
      return 'mice';
    case 'person':
      return 'people';
  }

  // Words ending in s, x, z, ch, sh → add "es"
  if (/(s|x|z|ch|sh)$/i.test(word)) return word + 'es';

  // Words ending in consonant + y → replace y with "ies"
  if (/[bcdfghjklmnpqrstvwxz]y$/i.test(word)) return word.slice(0, -1) + 'ies';

  // Words ending in f or fe → replace with "ves"
  if (/(?:f|fe)$/i.test(word)) return word.replace(/(?:f|fe)$/i, 'ves');

  // Default: just add "s"
  return word + 's';
}