python string format method for javascript

stringFormat.js

// function ----------------------------------------------------------
// ex: stringFormat("its like python{0} format", 3) ==> its like python3 format
export function stringFormat(string) {
  [...Array(arguments.length)].forEach(
    (_, i) => (string = string.replace("{" + (i - 1) + "}", arguments[i]))
  );
  return string;
}

// add to String prototype -------------------------------------------
// ex: "its like python{0} format".format(3) ==> its like python3 format
const buildStringFormat = () => {
  String.prototype.format = function () {
    var a = this;
    for (var k in arguments) {
      a = a.replace(new RegExp('\\{' + k + '\\}', 'g'), arguments[k]);
    }
    return a;
  };
};

const stringExtensions = () => {
  buildStringFormat();
};

export stringExtensions;