2

So, I noticed that on CodePen invalid property accessors that should give Syntax Error is working.

I have a res object:

let res = {
  "a" : {
    "b" : 123
  },
  "c" : 3
}

When I do:

console.log("Valid: ",  res["a"]["b"])
console.log("Invalid: ",  res.["a"].["b"])

I get a response on the console:

"Valid: " 123

"Invalid: " 123

As far as I know res.["a"].["b"] is invalid JavaScript Syntax and it doesn't work elsewhere. Is there any reason why it's implemented this way or am I missing something?

Here's a link to my CodePen containing the code.

Improve this question
3
  • 1
    This seems like an issue to file with CodePen directly. https://codepen.io/support/ Commented Jun 14, 2023 at 8:46
  • 1
    Looking for documentation of CodePen's AST parsing but can't find it directly. This question touches on what is happening in the background (though it is old) Strange JavaScript behavior in CodePen with humongous arrays Commented Jun 14, 2023 at 8:52
  • 1
    Alright, I've submitted it to CodePen support. Thanks Commented Jun 14, 2023 at 9:44
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