Rest parameter ...args is not supported by Heroku platform

Question

Rest parameter ...args is not supported by Heroku platform

When interacting with Heroku, an error message SyntaxError: Unexpected token ... appears.

What modifications should be made to this function for compatibility with Heroku?

authenticate(...args) {
            var authRequest = {};
            authRequest[Eureca.Protocol.authReq] = args;
            this.socket.send(this.serialize(authRequest));
        }

javascript node.js heroku

Answer 1

Answer №1

While I don't have extensive experience with Heroku, there is a neat trick you can use. By utilizing

Array.prototype.slice.call(arguments)

, you can achieve a similar outcome to using the rest operator in this scenario.

authenticate() {
  const args = Array.prototype.slice.call(arguments);
  var authRequest = {};
  authRequest[Eureca.Protocol.authReq] = args;
  this.socket.send(this.serialize(authRequest));
}

Take a look at this example.

function foo1(...args) {
  console.log(args);
}

function foo2() {
  const args = Array.prototype.slice.call(arguments);
  console.log(args);
}

foo1(1, 2, 3, 4);
foo2(1, 2, 3, 4);

Additionally, the following code is generated by passing the foo1 function through a babel transpiler.

function foo1() {
  for (var _len = arguments.length, args = Array(_len), _key = 0; _key < _len; _key++) {
    args[_key] = arguments[_key];
  }

  console.log(args);
}

Answer 2

While I don't have extensive experience with Heroku, there is a neat trick you can use. By utilizing

Array.prototype.slice.call(arguments)

, you can achieve a similar outcome to using the rest operator in this scenario.

authenticate() {
  const args = Array.prototype.slice.call(arguments);
  var authRequest = {};
  authRequest[Eureca.Protocol.authReq] = args;
  this.socket.send(this.serialize(authRequest));
}

Take a look at this example.

function foo1(...args) {
  console.log(args);
}

function foo2() {
  const args = Array.prototype.slice.call(arguments);
  console.log(args);
}

foo1(1, 2, 3, 4);
foo2(1, 2, 3, 4);

Additionally, the following code is generated by passing the foo1 function through a babel transpiler.

function foo1() {
  for (var _len = arguments.length, args = Array(_len), _key = 0; _key < _len; _key++) {
    args[_key] = arguments[_key];
  }

  console.log(args);
}

Rest parameter ...args is not supported by Heroku platform

Answer №1

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