Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.javascript > #21069

Re: Multiple image preload construct?

Show all headers | View raw

Christoph Michael Becker wrote:

> Ken wrote:
>> Oh, this is not C, this is ECMAScript in the JavaScript flavor, a
>> dynamic language. Nothing is compiled, everything is interpreted.
> 
> I assume most (if not all) recent ECMAScript implementations compile the
> source code instead of interpreting it.  Mostly the compilation is to
> byte code, but some implementations are (also) JIT compiling to native
> machine code (e.g. Google's V8 JavaScript Engine).

As a matter of historical fact, the maintainers of Netscape JavaScript and 
Microsoft JScript, Brendan Eich and Eric Lippert, respectively, have 
confirmed independently years ago that source code is *compiled* to bytecode 
by their browser-based script engines, and that this bytecode is executed by 
a virtual machine.  (I might still find the respective statements.)

So ISTM that, short of perhaps Netscape Mocha and LiveScript, *never* source 
code in a programming language that formed the basis of ECMAScript or that 
is based on ECMAScript has ever been interpreted verbatim, and it has always 
been compiled (whether you can call the subsequent execution of that 
bytecode by a virtual machine, or of native machine code by the CPU 
“interpretation” has always been a matter of hot debate).
 
>>                                                                    If you
>> understand how interpreting works you would know this doesn't really
>> matter (and in this case the bottleneck is not the loop).
> 
> I believe Thomas' criticism was not mainly regarding the performance,
> but about the readability (and maybe the stability) of the code.

ACK.

-- 
PointedEars

Twitter: @PointedEars2
Please do not Cc: me. / Bitte keine Kopien per E-Mail.

Back to comp.lang.javascript | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Multiple image preload construct? Tuxedo <tuxedo@mailinator.com> - 2013-08-27 16:32 +0200
  Re: Multiple image preload construct? Tuxedo <tuxedo@mailinator.com> - 2013-08-27 17:06 +0200
  Re: Multiple image preload construct? Danny <dann90038@gmail.com> - 2013-08-27 10:29 -0700
  Re: Multiple image preload construct? Ken <usenet-so@abdiassoftware.com> - 2013-08-27 13:32 -0500
    Re: Multiple image preload construct? Tuxedo <tuxedo@mailinator.com> - 2013-08-27 20:54 +0200
      Re: Multiple image preload construct? Ken <usenet-so@abdiassoftware.com> - 2013-08-27 18:19 -0500
        Re: Multiple image preload construct? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-08-28 01:37 +0200
          Re: Multiple image preload construct? Ken <usenet-so@abdiassoftware.com> - 2013-08-27 18:47 -0500
    Re: Multiple image preload construct? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-08-27 23:02 +0200
      Re: Multiple image preload construct? Cezary Tomczyk <cezary.tomczyk@gmail.com> - 2013-08-27 23:20 +0200
        Re: Multiple image preload construct? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-08-28 01:27 +0200
          Re: Multiple image preload construct? Cezary Tomczyk <cezary.tomczyk@gmail.com> - 2013-08-29 03:56 +0200
            Re: Multiple image preload construct? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-08-29 15:16 +0200
      Re: Multiple image preload construct? Ken <usenet-so@abdiassoftware.com> - 2013-08-27 18:43 -0500
        Re: Multiple image preload construct? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-08-28 02:08 +0200
          Re: Multiple image preload construct? Ken <usenet-so@abdiassoftware.com> - 2013-08-27 19:49 -0500
            Re: Multiple image preload construct? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-08-28 03:17 +0200
              Re: Multiple image preload construct? Ken <usenet-so@abdiassoftware.com> - 2013-08-27 20:35 -0500
                Re: Multiple image preload construct? Dr J R Stockton <reply1300@merlyn.demon.co.uk.invalid> - 2013-08-29 19:32 +0100
              Re: Multiple image preload construct? John Harris <niam@jghnorth.org.uk.invalid> - 2013-08-28 16:20 +0100
            Re: Multiple image preload construct? Andrew Poulos <ap_prog@hotmail.com> - 2013-08-28 11:21 +1000
              Re: Multiple image preload construct? Ken <usenet-so@abdiassoftware.com> - 2013-08-27 20:48 -0500
                Re: Multiple image preload construct? Andrew Poulos <ap_prog@hotmail.com> - 2013-08-28 13:43 +1000
                Re: Multiple image preload construct? John Harris <niam@jghnorth.org.uk.invalid> - 2013-08-29 10:00 +0100
                Re: Multiple image preload construct? Andrew Poulos <ap_prog@hotmail.com> - 2013-08-30 07:25 +1000
                Re: Multiple image preload construct? John Harris <niam@jghnorth.org.uk.invalid> - 2013-08-30 10:11 +0100
        Re: Multiple image preload construct? Christoph Michael Becker <cmbecker69@arcor.de> - 2013-08-28 02:17 +0200
          Re: Multiple image preload construct? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-08-28 02:38 +0200
      Re: Multiple image preload construct? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2013-08-28 11:04 +0200
      Re: Multiple image preload construct? John Harris <niam@jghnorth.org.uk.invalid> - 2013-08-28 16:26 +0100

csiph-web