Simple Javascript code not working in Google docs due to arrow function

Question

I have tried implementing a piece of simple code as a script in google docs. It\'s function is validating ID numbers. The problem is that the syntax used for this code is too ad

Answer 1

Edit: Arrow functions are currently supported with the V8 engine. See: https://developers.google.com/apps-script/guides/v8-runtime#arrow_functions

Google Apps Script (GAS) doesn't support ECMAScript 2015 (ES6) yet. Unfortunately, in the current stage, the functions which was added from ES6 cannot be used. So it is required to convert such functions for GAS. In your script, also such functions are used. So how about this modification?

Modification points :

• Arrow function cannot be used at GAS.
  • This was mentioned by CertainPerformance and NielsNet.
• Array.from() cannot be used at GAS.
  • Here, I used Array.map().

Modified script :

function isValidIsraeliID(id) {
  var id = String(id).trim();
  if (id.length > 9 || id.length < 5 || isNaN(id)) return false;

  // Pad string with zeros up to 9 digits
  id = id.length < 9 ? ("00000000" + id).slice(-9) : id;

  return Array.map(id, Number) // Modified
  .reduce(function(counter, digit, i) { // Modified
    const step = digit * ((i % 2) + 1);
    return counter + (step > 9 ? step - 9 : step);
  }) % 10 === 0;
}

References :

• Built-in Google Services: Basic JavaScript features
• Arrow functions
• Array.from()
• Array.prototype.map()

If this result was not what you want, please tell me. I would like to modify it.

Answer 2

Just replace the arrow function with a function:

.reduce(function(counter, digit, i) {