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Mongo script gotchas

  • no console.log, use print instead
  • no Object.entries, Object.values use Object.keys
  • Map, Set are not spec-compliant, Set values are stringified, Map are not iterable, don't use them
  • for (const foo of [1]) {} is also broken, it needs a let/var instead of const (warning: let might not be block-scoped as per spec, they probably just replace it by var)
  • Use doc._id + '' to get the objectId as hex string, don't rely on template strings also, they seem to incorrectly invoke doc._id.toString() which returns 'ObjectId(hexstring)'
  • Outdated RegExp, not supporting look-behinds
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