On 13/12/2012, at 01:47, Rick Waldron wrote: > > On Wed, Dec 12, 2012 at 7:20 PM, Jorge Chamorro <[email protected]> > wrote: > On 12/12/2012, at 18:37, Rick Waldron wrote: > > > > On Wed, Dec 12, 2012 at 2:17 AM, Isaac Schlueter <[email protected]> wrote: > > On Tue, Dec 11, 2012 at 7:18 PM, spqr <[email protected]> wrote: > > > maybe my question should have been "why does JavaScript have eval()?" ;-) > > > > I think a lot of people have wondered the same thing. > > > > Yes, it has its uses, but at this point, I don't know of any that > > aren't better served using some other mechanism. eval() has weird > > optimization-destroying semantics that cannot ever be changed, due to > > the fact that JavaScript must be backwards compatible forever. > > > > > > Runtime code generation? new Function( thecode ) works just as well, I guess > > ...sometimes: > > (function (p) { > > eval("(function(){console.log(p)})")(); > > try { > Function("console.log(p)")(); > } > catch (e) { > console.log("FAIL -> "+ e.message); > } > > })("OK"); > > OK > FAIL -> Can't find variable: p > > > Of course not, but that's not what I was talking about, is it? I definitely > said "Runtime code generation", by which I meant "the entire program" is > first generated, by some means, into a string, which is then eval'ed. See > also: Traceur, CoffeeScript (anything the compiles something else into > JavaScript at runtime)
(Sorry I hit send too soon) Well put, simple as that, I completely agree. What eval() is: a call right to the compiler as in compile(program), which is -no matter what they say- a very nice -power- feature to have. And a footgun? Perhaps *sometimes*, yes, so? Beware and don't be fool! Yet the fools are foolish and there's little to do about that, neither eval() *nor*the*threads* are evil, nor the culprits. -- Jorge. -- Job Board: http://jobs.nodejs.org/ Posting guidelines: https://github.com/joyent/node/wiki/Mailing-List-Posting-Guidelines You received this message because you are subscribed to the Google Groups "nodejs" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/nodejs?hl=en?hl=en
