Schrödinger’s Tcl – Values that differ if you look at them

Re:Schrödinger’s Tcl – Values that differ if you look at them by tyingq on Sunday September 17, 2017 @10:01AM (#15269633)

I don't think it's that easy. If the context is making javascript output something different in it's REPL for just "foo" vs "console.log(foo)", there's other pieces you would need.

Like overriding a built-in type and getting function.caller into valueOf(). As far as I can tell, JS doesn't let you just tweak valueOf(), you would have to re-implement all of, for example, the String class.

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Re:Schrödinger’s Tcl – Values that differ if you look at them by Darkenetor on Sunday September 17, 2017 @09:11PM (#15272693)

Reimplementing whole classes wouldn't have been a problem, just replace the original ones with a proxy to a copy.

Luckily console.log calls are actually excluded from the callers stack, so the only way is to change console itself. Just as evil if you also intercept console methods logging and return the original ones, but less of a mess at least.

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