Pluralize

This utility function returns the plural or singular form of an English word based on count.

tsCopy code
1interface IrregularPlurals {
2  [key: string]: string;
3}
4
5/**
6 * Returns the plural or singular form of an English word based on count
7 * @param word - The word to pluralize/singularize
8 * @param count - The count determining plural or singular form
9 * @returns The appropriate form of the word
10 */
11export function pluralize(word: string, count: number): string {
12  const irregularPlurals: IrregularPlurals = {
13    child: "children",
14    person: "people",
15    man: "men",
16    woman: "women",
17    tooth: "teeth",
18    foot: "feet",
19    mouse: "mice",
20    goose: "geese",
21  };
22
23  if (count === 1) {
24    return word;
25  }
26
27  const lowerWord = word.toLowerCase();
28  /* eslint-disable security/detect-object-injection */
29  if (irregularPlurals[lowerWord]) {
30    return irregularPlurals[lowerWord];
31  }
32  /* eslint-enable security/detect-object-injection */
33
34  if (word.endsWith("y")) {
35    const vowels: Array<string> = ["a", "e", "i", "o", "u"];
36    if (!vowels.includes(word.at(-2) ?? "")) {
37      return word.slice(0, -1) + "ies";
38    }
39  }
40
41  if (
42    word.endsWith("s") ||
43    word.endsWith("sh") ||
44    word.endsWith("ch") ||
45    word.endsWith("x") ||
46    word.endsWith("z")
47  ) {
48    return word + "es";
49  }
50
51  if (word.endsWith("f")) {
52    return word.slice(0, -1) + "ves";
53  }
54  if (word.endsWith("fe")) {
55    return word.slice(0, -2) + "ves";
56  }
57
58  return word + "s";
59}

Usage

tsxCopy code
1<span>{pluralize("like", like_count)}</span>

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