English Plurals to Singulars Code

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I need plural to singular jscript html code. Here is mine but it is not ok.

<title>Plural to Singular Converter</title> <style> body { display: flex; justify-content: center; align-items: center; height: 100vh; margin: 0; font-family: Arial, sans-serif; background-color: #f0f0f0; } .container { text-align: center; background: white; padding: 20px; border-radius: 8px; box-shadow: 0 0 10px rgba(0, 0, 0, 0.1); width: 80%; max-width: 600px; } textarea { width: 100%; height: 80px; margin-bottom: 10px; padding: 10px; border: 1px solid #ddd; border-radius: 4px; box-sizing: border-box; } </style>

Plural to Singular Converter

<textarea id="pluralText" placeholder="Enter plurals here, separated by commas or line breaks." oninput="convertToSingular()"></textarea> <textarea id="singularText" readonly placeholder="Singular forms will appear here..."></textarea>

<script>
    function convertToSingular() {
        const pluralText = document.getElementById('pluralText').value;
        const pluralPhrases = pluralText.split(/\s*,\s*|\s*\n\s*/).map(phrase => phrase.trim()).filter(Boolean);
        const singularPhrases = pluralPhrases.map(pluralToSingular);
        const singularText = singularPhrases.join(', ');
        document.getElementById('singularText').value = singularText;
        copyToClipboard(singularText);
    }

    function pluralToSingular(phrase) {
        const irregulars = {
            'children': 'child', 'men': 'man', 'women': 'woman', 'teeth': 'tooth',
            'feet': 'foot', 'geese': 'goose', 'mice': 'mouse', 'cacti': 'cactus',
            'fungi': 'fungus', 'nuclei': 'nucleus', 'octopi': 'octopus',
            'fisheries': 'fishery', 'species': 'species', 'gases': 'gas',
            'resources': 'resource', 'substances': 'substance', 'apparatuses': 'apparatus',
            'data': 'datum', 'criteria': 'criterion', 'media': 'medium',
            'fixtures': 'fixture'
        };

        const words = phrase.split(/\s+/);
        let lastWord = words[words.length - 1].toLowerCase();

        if (irregulars[lastWord]) {
            words[words.length - 1] = irregulars[lastWord];
            return words.join(' ');
        }

        if (lastWord.endsWith('ies')) {
            words[words.length - 1] = lastWord.replace(/ies$/, 'y');
        } else if (lastWord.endsWith('ves')) {
            words[words.length - 1] = lastWord.replace(/ves$/, 'f');
        } else if (lastWord.endsWith('es') && !lastWord.endsWith('ses') && !lastWord.endsWith('xes') && !lastWord.endsWith('ches') && !lastWord.endsWith('shes') && !lastWord.endsWith('oes')) {
            words[words.length - 1] = lastWord.replace(/es$/, '');
        } else if (lastWord.endsWith('s') && !lastWord.endsWith('ss') && !lastWord.endsWith('us')) {
            words[words.length - 1] = lastWord.replace(/s$/, '');
        }

        return words.join(' ');
    }

    function copyToClipboard(text) {
        navigator.clipboard.writeText(text).catch(err => console.error('Failed to copy: ', err));
    }
</script>