Uncaught SyntaxError: Got ?[198] expected ID

Posted on
  • Mon 2021.09.06

    During development, attempted to create shortened two letter function names that maintained alignment.

    Significantly shortened statement:

    function of() { }

    Throws error:

    Uncaught SyntaxError: Got ?[198] expected ID

    There is no immediate rush to resolve this for me as I've created a temporary workaround. More curious as to what is causing this.

      VERSION: "2v00",
      GIT_COMMIT: "ff35517",
      BOARD: "ESP8266_4MB",
      FLASH: 0, RAM: 81920,
      MODULES: "Flash,Storage,hea" ... "r,crypto,neopixel",

    of is not a reserved word:


    However, I did find a reference used within a for loop:


    I'm making the assumption that 'of' might be parsed as part of the statement syntax in this case, but really doesn't answer why a function may not have the same name as it isn't a reserved keyword.

  • Thanks! In Espruino, of is a reserved word because of for (var i of foo) so I'm surprised it's actually not in the JS spec.

    I'd been having issues with the Layout.js file when pretokenised, so it's actually possible you're having the same issue. I just filed a bug for this so I can track it https://github.com/espruino/Espruino/iss­ues/2047

    This particular one should be an easy fix (changing the pretokeniser to ignore 'of') but there are definitely other cases like this where it could be a problem.

  • Turns out the pretokeniser issue is unrelated, so this issue is very specifically just if you decide to call a function of.

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Uncaught SyntaxError: Got ?[198] expected ID

Posted by Avatar for Robin @Robin