Source: apc-abstract/lib/string/is_string.js

/**
 * Check a value is string or not.
 * @function lib.string.isString
 * @param {*} obj - Value.
 * @returns {boolean} - Is string or not.
 * @author Taka Okunishi
 */
module.exports = function (obj) {
    return typeof(obj) === 'string';
};