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Groups > comp.lang.javascript > #39929
| From | Ben Bacarisse <ben.usenet@bsb.me.uk> |
|---|---|
| Newsgroups | comp.lang.javascript |
| Subject | Re: I don't get it |
| Date | 2021-04-14 01:32 +0100 |
| Organization | A noiseless patient Spider |
| Message-ID | <875z0pn1sr.fsf@bsb.me.uk> (permalink) |
| References | (16 earlier) <845c8b8e-d415-4b41-8327-6b31bc50825an@googlegroups.com> <1ae0aa1d-162d-4666-acf9-50376e1acd9fn@googlegroups.com> <8090782c-7564-4881-a97e-70dd1e865674n@googlegroups.com> <87y2dmmgln.fsf@bsb.me.uk> <s550nh$f6a$1@dont-email.me> |
The Natural Philosopher <tnp@invalid.invalid> writes: > On 13/04/2021 14:58, Ben Bacarisse wrote: >> The function is doing exactly what you wrote. > > Not for at least two decades, and certainly not in JavaScript. > > The function is doing what the compiler and/or interpreter decided you > *meant* by what you wrote. It's a common mistake to think of code as implying more than it does. This is particularly true of high-level languages like ECMAScript, but it's also true of languages like C. Assuming more than the language guarantees has been the source of many bugs in C programs. > Which is why you now have new keywords like 'volatile' to try and > force it not to be clever with loop optimisations and Number() to > ensure it actually does cast an unknown variable type to a number... Hmm... Your recent Number() example seems to be simply a case of your not knowing what the language guarantees. > Years ago I could look at a bit of C code and translate it into the > actual assembler that the compiler would spit out. Today it produces > nothing like that at all. > > So far I have always been impressed at how good it was at > optimisation, but as I have said elsewhere, sometimes it gets it > wrong. I agree that all of this is contingent on the specification being clear and there being no bugs in the language implementation. But in JT's case, I would be very surprised if the problem where a bug in the implementation. All beginners think they have found a compiler bug! > And there are holes in the spec - areas that are 'indeterminate' and > up to the whim of the compiler/interpreter and of course things like > uninitialised memory. > > Then when you get to concurrent threads... -- Ben.
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I don't get it Jonas Thörnvall <jonas.thornvall@gmail.com> - 2021-04-08 03:32 -0700
Re: I don't get it Jonas Thörnvall <jonas.thornvall@gmail.com> - 2021-04-08 03:37 -0700
Re: I don't get it Jonas Thörnvall <jonas.thornvall@gmail.com> - 2021-04-08 04:26 -0700
Re: I don't get it JJ <jj4public@gmail.com> - 2021-04-08 19:39 +0700
Re: I don't get it Jonas Thörnvall <jonas.thornvall@gmail.com> - 2021-04-08 05:53 -0700
Re: I don't get it Jonas Thörnvall <jonas.thornvall@gmail.com> - 2021-04-08 13:55 -0700
Re: I don't get it Jonas Thörnvall <jonas.thornvall@gmail.com> - 2021-04-09 00:46 -0700
Re: I don't get it The Natural Philosopher <tnp@invalid.invalid> - 2021-04-09 10:03 +0100
Re: I don't get it Jonas Thörnvall <jonas.thornvall@gmail.com> - 2021-04-09 04:09 -0700
Re: I don't get it "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2021-04-09 11:07 -0700
Re: I don't get it The Natural Philosopher <tnp@invalid.invalid> - 2021-04-10 03:23 +0100
Re: I don't get it "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2021-04-10 22:02 -0700
Re: I don't get it Jonas Thörnvall <jonas.thornvall@gmail.com> - 2021-04-11 01:05 -0700
Re: I don't get it Jonas Thörnvall <jonas.thornvall@gmail.com> - 2021-04-11 01:07 -0700
Re: I don't get it The Natural Philosopher <tnp@invalid.invalid> - 2021-04-11 11:42 +0100
Re: I don't get it John G Harris <niam@jghnorth.org.uk.invalid> - 2021-04-09 20:01 +0100
Re: I don't get it Jonas Thörnvall <jonas.thornvall@gmail.com> - 2021-04-09 13:31 -0700
Re: I don't get it The Natural Philosopher <tnp@invalid.invalid> - 2021-04-10 03:37 +0100
Re: I don't get it Jonas Thörnvall <jonas.thornvall@gmail.com> - 2021-04-09 23:53 -0700
Re: I don't get it John G Harris <niam@jghnorth.org.uk.invalid> - 2021-04-10 12:05 +0100
Re: I don't get it Ben Bacarisse <ben.usenet@bsb.me.uk> - 2021-04-10 15:59 +0100
Re: I don't get it Ben Bacarisse <ben.usenet@bsb.me.uk> - 2021-04-10 15:47 +0100
Re: I don't get it The Natural Philosopher <tnp@invalid.invalid> - 2021-04-10 18:25 +0100
Re: I don't get it Jon Ribbens <jon+usenet@unequivocal.eu> - 2021-04-10 17:29 +0000
Re: I don't get it Ben Bacarisse <ben.usenet@bsb.me.uk> - 2021-04-10 19:08 +0100
Re: I don't get it The Natural Philosopher <tnp@invalid.invalid> - 2021-04-11 11:41 +0100
Re: I don't get it Ben Bacarisse <ben.usenet@bsb.me.uk> - 2021-04-11 14:33 +0100
Re: I don't get it Jonas Thörnvall <jonas.thornvall@gmail.com> - 2021-04-12 02:39 -0700
Re: I don't get it Ben Bacarisse <ben.usenet@bsb.me.uk> - 2021-04-12 11:21 +0100
Re: I don't get it Jonas Thörnvall <jonas.thornvall@gmail.com> - 2021-04-12 10:19 -0700
Re: I don't get it Ben Bacarisse <ben.usenet@bsb.me.uk> - 2021-04-12 21:20 +0100
Re: I don't get it "sc...@sauyet.com" <scott@sauyet.com> - 2021-04-12 14:32 -0700
Re: I don't get it Jonas Thörnvall <jonas.thornvall@gmail.com> - 2021-04-13 04:11 -0700
Re: I don't get it Ben Bacarisse <ben.usenet@bsb.me.uk> - 2021-04-13 14:58 +0100
Re: I don't get it Jonas Thörnvall <jonas.thornvall@gmail.com> - 2021-04-13 09:20 -0700
Re: I don't get it Jonas Thörnvall <jonas.thornvall@gmail.com> - 2021-04-13 09:29 -0700
Re: I don't get it Ben Bacarisse <ben.usenet@bsb.me.uk> - 2021-04-13 20:06 +0100
Re: I don't get it "sc...@sauyet.com" <scott@sauyet.com> - 2021-04-13 15:09 -0700
Re: I don't get it Jonas Thörnvall <jonas.thornvall@gmail.com> - 2021-04-14 01:15 -0700
Re: I don't get it "sc...@sauyet.com" <scott@sauyet.com> - 2021-04-14 05:22 -0700
Re: I don't get it Jonas Thörnvall <jonas.thornvall@gmail.com> - 2021-04-15 11:52 -0700
Re: I don't get it Jonas Thörnvall <jonas.thornvall@gmail.com> - 2021-04-15 11:57 -0700
Re: I don't get it Jonas Thörnvall <jonas.thornvall@gmail.com> - 2021-04-15 12:04 -0700
Re: I don't get it Scott Sauyet <scott.sauyet@gmail.com> - 2021-04-15 19:29 -0700
Re: I don't get it Jonas Thörnvall <jonas.thornvall@gmail.com> - 2021-04-20 14:12 -0700
Re: I don't get it Jonas Thörnvall <jonas.thornvall@gmail.com> - 2021-04-20 14:47 -0700
Re: I don't get it Jonas Thörnvall <jonas.thornvall@gmail.com> - 2021-04-20 23:35 -0700
Re: I don't get it Jonas Thörnvall <jonas.thornvall@gmail.com> - 2021-04-21 01:08 -0700
Re: I don't get it Jonas Thörnvall <jonas.thornvall@gmail.com> - 2021-04-21 01:24 -0700
Re: I don't get it Jonas Thörnvall <jonas.thornvall@gmail.com> - 2021-04-21 01:29 -0700
Re: I don't get it Jonas Thörnvall <jonas.thornvall@gmail.com> - 2021-04-13 09:32 -0700
Re: I don't get it The Natural Philosopher <tnp@invalid.invalid> - 2021-04-13 21:59 +0100
Re: I don't get it Ben Bacarisse <ben.usenet@bsb.me.uk> - 2021-04-14 01:32 +0100
Re: I don't get it The Natural Philosopher <tnp@invalid.invalid> - 2021-04-14 09:08 +0100
Re: I don't get it Ben Bacarisse <ben.usenet@bsb.me.uk> - 2021-04-14 10:06 +0100
Re: I don't get it The Natural Philosopher <tnp@invalid.invalid> - 2021-04-14 10:59 +0100
Re: I don't get it Ben Bacarisse <ben.usenet@bsb.me.uk> - 2021-04-14 14:05 +0100
Re: I don't get it The Natural Philosopher <tnp@invalid.invalid> - 2021-04-14 16:32 +0100
Re: I don't get it Ben Bacarisse <ben.usenet@bsb.me.uk> - 2021-04-14 23:53 +0100
Re: I don't get it The Natural Philosopher <tnp@invalid.invalid> - 2021-04-15 13:56 +0100
Re: I don't get it The Natural Philosopher <tnp@invalid.invalid> - 2021-04-12 11:20 +0100
Re: I don't get it Ben Bacarisse <ben.usenet@bsb.me.uk> - 2021-04-08 15:21 +0100
Re: I don't get it Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2021-04-09 16:50 +0200
Re: I don't get it Man From a city with name Viljandi <he12457@hotmail.com> - 2021-04-08 10:44 -0700
Re: I don't get it Jonas Thörnvall <jonas.thornvall@gmail.com> - 2021-04-10 00:01 -0700
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