Function postfix

javascriptv3/example_code/libs/utils/util-string.js:32–38

(source, str)

};

export const postfix = (source, str) => {
  if (typeof str !== "string") {
    throw new Error("Cannot postfix a non-string value.");
  }

  return `${source}${str}`;
};

/**
 * @param {string} str