funkjunky/schemaless-normalizer

export default word => {
    const lastLetter = word.slice(-1);

    if (lastLetter === 'y') return word.slice(0, -1) + 'ies';
    else                    return word + 's';
};

export const singulize = word => {
    if (word.substr(-3) === 'ies')  return word.slice(0, -3) + 'y';
    else                            return word.slice(0, -1);
};