pluralize

pluralize.js

function pluralize(count, word) {
    // Basic pluralization rules
    const pluralRules = [
        { match: /(?:ch|sh|ss|x|z)$/, replace: "$&es" }, // Matches words ending in ch, sh, ss, x, z
        { match: /([^aeiou])y$/, replace: "$1ies" }, // Changes words ending in y preceded by a consonant to ies
        { match: /([^aeiou])o$/, replace: "$1oes" }, // Changes words ending in o preceded by a consonant to oes (e.g., hero to heroes)
        { match: /is$/, replace: "es" }, // Special case for words ending in is
        { match: /([^aeiou]o)$/, replace: "$1es" }, // Special case for words ending in o preceded by a consonant
        // Add more rules as needed
    ];

    // Irregular plural forms
    const irregulars = {
        child: "children",
        person: "people",
        man: "men",
        woman: "women",
        mouse: "mice",
        goose: "geese",
        // Add more irregular forms as needed
    };

    // Return the word if count is 1, else find the plural form
    if (count === 1) return word;

    // Check if the word is an irregular form
    if (irregulars[word.toLowerCase()]) {
        return irregulars[word.toLowerCase()];
    }

    // Apply pluralization rules
    for (let i = 0; i < pluralRules.length; i++) {
        const rule = pluralRules[i];
        if (rule.match.test(word)) {
            return word.replace(rule.match, rule.replace);
        }
    }

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

// Example usage
console.log(pluralize(1, 'incident')); // "incident"
console.log(pluralize(2, 'incident')); // "incidents"
console.log(pluralize(1, 'alias'));    // "alias"
console.log(pluralize(2, 'alias'));    // "aliases"
console.log(pluralize(3, 'child'));    // "children"
console.log(pluralize(2, 'goose'));    // "geese"