/** * Choose between singular or plural form based on the number of elements. * * @example * > choosePlural(1, 'example', '.s') * 'example' * > choosePlural(4, 'example', '.s') * 'examples' * > choosePlural(0, 'radius', 'radii') * 'radii' * * @param count Number of elements. * @param singular Singular form. * @param plural Plural form. An initial dot will be replaced by `singular`. * @return Appropriate form. */ const choosePlural = (count, singular, plural) => { if (count === 1) { return singular; } else { return plural.replace(/^\./, singular); } }; exports.choosePlural = choosePlural; /** * Join elements with the given separator and a special separator for the last * element. * * @example * > joinSentence(['apple', 'orange', 'banana'], ', ', ' and ') * 'apple, orange and banana' * > joinSentence(['apple', 'banana'], ', ', ' and ') * 'apple and banana' * > joinSentence(['banana'], ', ', ' and ') * 'banana' * * @param array Sequence of strings to join. * @param separator Separator for all elements but the last one. * @param lastSeparator Separator for the last element. * @return Joined string. */ const joinSentence = (array, separator, lastSeparator) => { if (array.length <= 2) { return array.join(lastSeparator); } return array.slice(0, -1).join(separator) + lastSeparator + array[array.length - 1]; }; exports.joinSentence = joinSentence; /** * Check if a value is a JS object. * * @param value Value to check. * @return True iff. `value` is a JS object. */ const isObject = value => value !== null && typeof value === 'object'; exports.isObject = isObject;