Error.prototype.toString()

Baseline Widely available

This feature is well established and works across many devices and browser versions. Itâs been available across browsers since Ð¸ÑÐ»Ñ 2015 Ð³..

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e.toString()

Error.prototype.toString = function () {
  "use strict";

  var obj = Object(this);
  if (obj !== this) {
    throw new TypeError();
  }

  var name = this.name;
  name = name === undefined ? "Error" : String(name);

  var msg = this.message;
  msg = msg === undefined ? "" : String(msg);

  if (name === "") {
    return msg;
  }
  if (msg === "") {
    return name;
  }

  return name + ": " + msg;
};

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var e = new Error("Ð½ÐµÐ¿Ð¾Ð¿ÑÐ°Ð²Ð¸Ð¼Ð°Ñ Ð¾ÑÐ¸Ð±ÐºÐ°");
print(e.toString()); // 'Error: Ð½ÐµÐ¿Ð¾Ð¿ÑÐ°Ð²Ð¸Ð¼Ð°Ñ Ð¾ÑÐ¸Ð±ÐºÐ°'

e.name = undefined;
print(e.toString()); // 'Error: Ð½ÐµÐ¿Ð¾Ð¿ÑÐ°Ð²Ð¸Ð¼Ð°Ñ Ð¾ÑÐ¸Ð±ÐºÐ°'

e.name = "";
print(e.toString()); // 'Ð½ÐµÐ¿Ð¾Ð¿ÑÐ°Ð²Ð¸Ð¼Ð°Ñ Ð¾ÑÐ¸Ð±ÐºÐ°'

e.message = undefined;
print(e.toString()); // 'Error'

e.name = "Ð¿ÑÐ¸Ð²ÐµÑ";
print(e.toString()); // 'Ð¿ÑÐ¸Ð²ÐµÑ'