Comments for Joh Man X in action http://johmanx.com I fail to see why I shouldn't stay a geek Tue, 13 Sep 2011 21:01:02 +0000 hourly 1 http://wordpress.org/?v=3.3.1 Comment on Pitfalls of the newbie JavaScripter by Jan-Marten de Boer http://johmanx.com/2011/09/pitfalls-of-the-newbie-javascripter/#comment-3157 Jan-Marten de Boer Tue, 13 Sep 2011 21:01:02 +0000 http://blog.lievheid.nl/?p=354#comment-3157 You're a great help and I'm going to implement your example in the article pretty soon-ish. I really want this to be an excellent resource on the net, so we can all reference it when we need it. That's why I really appreciate all the input, since I'm no expert at JavaScript at all. If you have suggestions for the article like you did before, don't be shy to share it, 'cause I really want us developers to make a better web together. Isn't that why we put the effort in writing this tutorials? You’re a great help and I’m going to implement your example in the article pretty soon-ish. I really want this to be an excellent resource on the net, so we can all reference it when we need it. That’s why I really appreciate all the input, since I’m no expert at JavaScript at all.

If you have suggestions for the article like you did before, don’t be shy to share it, ’cause I really want us developers to make a better web together. Isn’t that why we put the effort in writing this tutorials?

]]> Comment on Pitfalls of the newbie JavaScripter by pepkin88 http://johmanx.com/2011/09/pitfalls-of-the-newbie-javascripter/#comment-3145 pepkin88 Mon, 12 Sep 2011 23:48:10 +0000 http://blog.lievheid.nl/?p=354#comment-3145 Strictly speaking I made mistake. A JavaScript function isn't a closure, but creates one. That function WITH every variable accessed from its scope is a closure. (I hope I haven't mistaken on this one.) Strictly speaking I made mistake. A JavaScript function isn’t a closure, but creates one. That function WITH every variable accessed from its scope is a closure.
(I hope I haven’t mistaken on this one.)

]]> Comment on Pitfalls of the newbie JavaScripter by pepkin88 http://johmanx.com/2011/09/pitfalls-of-the-newbie-javascripter/#comment-3144 pepkin88 Mon, 12 Sep 2011 23:41:12 +0000 http://blog.lievheid.nl/?p=354#comment-3144 I think it is a good idea to show a certain problem with "this" keyword, namely: http://jsfiddle.net/pepkin88/G6Ld2/1/ When you invoke a private function from your object's method you should remember that "this" keyword refers to current object only in that function's scope [1][2] (and not even in the nested function's scope [3]). To repair this use call method of function [4][5] or use "this" reference saved in other variable [6][7]. Cheers. I think it is a good idea to show a certain problem with “this” keyword, namely: http://jsfiddle.net/pepkin88/G6Ld2/1/

When you invoke a private function from your object’s method you should remember that “this” keyword refers to current object only in that function’s scope [1][2] (and not even in the nested function’s scope [3]). To repair this use call method of function [4][5] or use “this” reference saved in other variable [6][7].

Cheers.

]]> Comment on Pitfalls of the newbie JavaScripter by pepkin88 http://johmanx.com/2011/09/pitfalls-of-the-newbie-javascripter/#comment-3142 pepkin88 Mon, 12 Sep 2011 23:22:18 +0000 http://blog.lievheid.nl/?p=354#comment-3142 The reason why someVar isn't disposed is because a JavaScript function is a closure. That means every variable which is visible for the function (even if you're not using all of them) remains as long as that function could be used (the reference to that function isn't lost). There is no need for another example of the function scope. The reason why someVar isn’t disposed is because a JavaScript function is a closure. That means every variable which is visible for the function (even if you’re not using all of them) remains as long as that function could be used (the reference to that function isn’t lost).
There is no need for another example of the function scope.

]]> Comment on Pitfalls of the newbie JavaScripter by pepkin88 http://johmanx.com/2011/09/pitfalls-of-the-newbie-javascripter/#comment-3140 pepkin88 Mon, 12 Sep 2011 22:48:56 +0000 http://blog.lievheid.nl/?p=354#comment-3140 And by "self-invoking function" I meant "immediately self-invoking function" as opposed to simple recursion. Sorry for inconsistence. And by “self-invoking function” I meant “immediately self-invoking function” as opposed to simple recursion. Sorry for inconsistence.

]]> Comment on Pitfalls of the newbie JavaScripter by pepkin88 http://johmanx.com/2011/09/pitfalls-of-the-newbie-javascripter/#comment-3139 pepkin88 Mon, 12 Sep 2011 22:42:17 +0000 http://blog.lievheid.nl/?p=354#comment-3139 Also the self-invoking function doesn't have to be anonymous. For example: var result = (function factorial(n) { return n < 2 ? 1 : n * factorial(n - 1); })(5); We created self-invoking recursive non-anonymous function. Here I could omit the parenthesis and the code would still work: var result = function factorial(n) { return n < 2 ? 1 : n * factorial(n - 1); }(5); That's because function statement in this syntax can only be function expression. And being function expression is essential when we are trying to create self-invoking functions. Although, as you've written first, putting this statement in parenthesis increases readability. However parenthesis are important and necessary when the function statement is first thing on a line, because only then it could be misinterpreted as function definition. I'm sure you are aware of those things, I just wanted to clarify some issues. Anyway, great article :) Also the self-invoking function doesn’t have to be anonymous. For example:
var result = (function factorial(n) {
return n < 2 ? 1 : n * factorial(n – 1);
})(5);
We created self-invoking recursive non-anonymous function. Here I could omit the parenthesis and the code would still work:
var result = function factorial(n) {
return n < 2 ? 1 : n * factorial(n – 1);
}(5);
That's because function statement in this syntax can only be function expression. And being function expression is essential when we are trying to create self-invoking functions. Although, as you've written first, putting this statement in parenthesis increases readability.
However parenthesis are important and necessary when the function statement is first thing on a line, because only then it could be misinterpreted as function definition.

I'm sure you are aware of those things, I just wanted to clarify some issues.
Anyway, great article :)

]]> Comment on Pitfalls of the newbie JavaScripter by pepkin88 http://johmanx.com/2011/09/pitfalls-of-the-newbie-javascripter/#comment-3137 pepkin88 Mon, 12 Sep 2011 21:57:24 +0000 http://blog.lievheid.nl/?p=354#comment-3137 Thank you and your welcome :) Thank you and your welcome :)

]]> Comment on Pitfalls of the newbie JavaScripter by Jan-Marten de Boer http://johmanx.com/2011/09/pitfalls-of-the-newbie-javascripter/#comment-3043 Jan-Marten de Boer Thu, 08 Sep 2011 18:15:33 +0000 http://blog.lievheid.nl/?p=354#comment-3043 And you've got one heck of a nice landing page. Awesome canvas magic ^^ And you’ve got one heck of a nice landing page. Awesome canvas magic ^^

]]> Comment on Pitfalls of the newbie JavaScripter by Jan-Marten de Boer http://johmanx.com/2011/09/pitfalls-of-the-newbie-javascripter/#comment-3042 Jan-Marten de Boer Thu, 08 Sep 2011 18:10:38 +0000 http://blog.lievheid.nl/?p=354#comment-3042 Thanks, mate. Updated the article correspondingly. Thanks, mate. Updated the article correspondingly.

]]> Comment on Pitfalls of the newbie JavaScripter by pepkin88 http://johmanx.com/2011/09/pitfalls-of-the-newbie-javascripter/#comment-3012 pepkin88 Wed, 07 Sep 2011 14:30:30 +0000 http://blog.lievheid.nl/?p=354#comment-3012 In section about self-invoking anonymous functions you write: "Because JavaScript allows us to place ( ) around pretty much everything, we make use of that for better readability." Actually it is not for better readability. Statement without the parenthesis is function definition, but with error, because function definition requires giving name. But with the parenthesis the code is parsed as function expression, which allows not giving a name for a function. In section about self-invoking anonymous functions you write:
“Because JavaScript allows us to place ( ) around pretty much everything, we make use of that for better readability.”
Actually it is not for better readability. Statement without the parenthesis is function definition, but with error, because function definition requires giving name. But with the parenthesis the code is parsed as function expression, which allows not giving a name for a function.

]]> Comment on Pitfalls of the newbie JavaScripter by Jan-Marten de Boer http://johmanx.com/2011/09/pitfalls-of-the-newbie-javascripter/#comment-3008 Jan-Marten de Boer Wed, 07 Sep 2011 10:49:03 +0000 http://blog.lievheid.nl/?p=354#comment-3008 Thanks a lot. Yeah, that's a grave mistake on my account. Fixed that! Thanks a lot. Yeah, that’s a grave mistake on my account. Fixed that!

]]> Comment on Pitfalls of the newbie JavaScripter by Ryan McGrath http://johmanx.com/2011/09/pitfalls-of-the-newbie-javascripter/#comment-2965 Ryan McGrath Mon, 05 Sep 2011 17:35:16 +0000 http://blog.lievheid.nl/?p=354#comment-2965 Your section on hoisting (and watefalling down from that) contain a bunch of these: (functon() { ... }); When I believe you actually want... (function() { ...})(); The code samples you're showing off there would never actually execute. ;) Your section on hoisting (and watefalling down from that) contain a bunch of these:

(functon() { … });

When I believe you actually want…

(function() { …})();

The code samples you’re showing off there would never actually execute. ;)

]]> Comment on Pitfalls of the newbie JavaScripter by Jan-Marten de Boer http://johmanx.com/2011/09/pitfalls-of-the-newbie-javascripter/#comment-2932 Jan-Marten de Boer Sun, 04 Sep 2011 11:24:08 +0000 http://blog.lievheid.nl/?p=354#comment-2932 Could you help me out delivering a proper example? I'm looking into it, but maybe you've got something up your sleeve? Could you help me out delivering a proper example? I’m looking into it, but maybe you’ve got something up your sleeve?

]]> Comment on Pitfalls of the newbie JavaScripter by Jan Kuča http://johmanx.com/2011/09/pitfalls-of-the-newbie-javascripter/#comment-2927 Jan Kuča Sun, 04 Sep 2011 08:34:46 +0000 http://blog.lievheid.nl/?p=354#comment-2927 It's still wrong though. You don't get an error. The someVar variable is not disposed. The code is completely OK. It’s still wrong though. You don’t get an error. The someVar variable is not disposed. The code is completely OK.

]]> Comment on Pitfalls of the newbie JavaScripter by Jan-Marten de Boer http://johmanx.com/2011/09/pitfalls-of-the-newbie-javascripter/#comment-2926 Jan-Marten de Boer Sun, 04 Sep 2011 08:12:08 +0000 http://blog.lievheid.nl/?p=354#comment-2926 You are actually right about that. Completely pulled a fast one on that example. I've rewritten it to call myFunc separately now. You are actually right about that. Completely pulled a fast one on that example. I’ve rewritten it to call myFunc separately now.

]]> Comment on Pitfalls of the newbie JavaScripter by Jan Kuča http://johmanx.com/2011/09/pitfalls-of-the-newbie-javascripter/#comment-2925 Jan Kuča Sun, 04 Sep 2011 07:26:16 +0000 http://blog.lievheid.nl/?p=354#comment-2925 Hi, I just want to point to an error in one of your examples. (function(){ var someVar = 12; window.myFunc = function(){ console.log(someVar); }(); // 12 })(); myFunc(); You don't get a ReferenceError but a TypeError stating that myFunc is not a function. That is because you assign undefined to window.myFunc. The expression is interpreted like this: window.myFunc = function () { console.log(someVar); return undefined; }(); As you can see the function returns undefined and since you auto-execute the function before the assignment, that is what gets assigned to window.myFunc. If you didn't auto-execute the function, the function itself is would be assigned to window.myFunc and when you called the function (at the bottom of your example), you wouldn't get a ReferenceError because the contents of the scope in which someVar is declared were not garbage-collected as you create a closure that keeps a reference to the variable. Cheers ;-) Hi, I just want to point to an error in one of your examples.

(function(){
var someVar = 12;
window.myFunc = function(){
console.log(someVar);
}(); // 12
})();
myFunc();

You don’t get a ReferenceError but a TypeError stating that myFunc is not a function. That is because you assign undefined to window.myFunc. The expression is interpreted like this:

window.myFunc = function () { console.log(someVar); return undefined; }();

As you can see the function returns undefined and since you auto-execute the function before the assignment, that is what gets assigned to window.myFunc.

If you didn’t auto-execute the function, the function itself is would be assigned to window.myFunc and when you called the function (at the bottom of your example), you wouldn’t get a ReferenceError because the contents of the scope in which someVar is declared were not garbage-collected as you create a closure that keeps a reference to the variable.

Cheers ;-)

]]> Comment on Creating an HTTP proxy for Wikipedia by Andries Louw Wolthuizen http://johmanx.com/2010/10/creating-an-http-proxy-for-wikipedia/#comment-2139 Andries Louw Wolthuizen Fri, 24 Jun 2011 04:10:16 +0000 http://blog.lievheid.nl/?p=171#comment-2139 Using exec brings risks, not every server supports exec or its contents (safe mode, and open basedir restrictions apply to dig itself), plus it needs another proces. Maybe you were unaware of a native implementation in the PHP core. For uncommon libraries I can see why you would prefer using exec though. Teach people the right way, and use things that are common on shared hosting platforms, not everyone is blessed with a dedicated server :-) Using exec brings risks, not every server supports exec or its contents (safe mode, and open basedir restrictions apply to dig itself), plus it needs another proces. Maybe you were unaware of a native implementation in the PHP core. For uncommon libraries I can see why you would prefer using exec though.

Teach people the right way, and use things that are common on shared hosting platforms, not everyone is blessed with a dedicated server :-)

]]> Comment on Creating an HTTP proxy for Wikipedia by Joh Man X http://johmanx.com/2010/10/creating-an-http-proxy-for-wikipedia/#comment-2133 Joh Man X Thu, 23 Jun 2011 05:51:43 +0000 http://blog.lievheid.nl/?p=171#comment-2133 I actually prefer it my way, because I don't account for Windows systems and have a strong opinion about using system commands over uncommon libraries. Now in this example, the dns library probably is a core one, but when using mplayer to calculate the length of a song, i'd rather use the command to retrieve specific data over asking a library, which gets populated with a lot of information I don't want to use, stored in an object. That and the likelyhood of the library not being installed at the readers server makes me suggest this solution. I actually prefer it my way, because I don’t account for Windows systems and have a strong opinion about using system commands over uncommon libraries. Now in this example, the dns library probably is a core one, but when using mplayer to calculate the length of a song, i’d rather use the command to retrieve specific data over asking a library, which gets populated with a lot of information I don’t want to use, stored in an object. That and the likelyhood of the library not being installed at the readers server makes me suggest this solution.

]]> Comment on Creating an HTTP proxy for Wikipedia by Andries Louw Wolthuizen http://johmanx.com/2010/10/creating-an-http-proxy-for-wikipedia/#comment-2132 Andries Louw Wolthuizen Thu, 23 Jun 2011 05:43:21 +0000 http://blog.lievheid.nl/?p=171#comment-2132 Exec and dig? You should use: http://us2.php.net/manual/en/function.dns-get-record.php ;-) Exec and dig? You should use: http://us2.php.net/manual/en/function.dns-get-record.php ;-)

]]> Comment on Finding clients the easy way by Joh Man X http://johmanx.com/2010/08/finding-clients-the-easy-way/#comment-446 Joh Man X Wed, 10 Nov 2010 21:13:21 +0000 http://blog.lievheid.nl/?p=120#comment-446 Pretty neat work yourself Anita. You actually took the recognition of different tweets to a whole new level, although I'm not sure if it's that much of an add to the currently available search page on Twitter, I do see the benefits of being able to filter between offers and questions. I think our goals are ultimitaly the same, but I really longed for a system that doesn't require user input to work. I'm not too sure as to what you offer for members of your site, but you could offer them a service, similar to mine, where they can bookmark the page or make it one of their home tabs. You should also consider taking a look at the paper.li service, giving my page as an example: http://paper.li/johmanx10 Pretty neat work yourself Anita. You actually took the recognition of different tweets to a whole new level, although I’m not sure if it’s that much of an add to the currently available search page on Twitter, I do see the benefits of being able to filter between offers and questions. I think our goals are ultimitaly the same, but I really longed for a system that doesn’t require user input to work. I’m not too sure as to what you offer for members of your site, but you could offer them a service, similar to mine, where they can bookmark the page or make it one of their home tabs. You should also consider taking a look at the paper.li service, giving my page as an example: http://paper.li/johmanx10

]]> Comment on Finding clients the easy way by Anita CM http://johmanx.com/2010/08/finding-clients-the-easy-way/#comment-428 Anita CM Sun, 07 Nov 2010 05:43:28 +0000 http://blog.lievheid.nl/?p=120#comment-428 Pretty neat work John - I would say a very handy script for freelance programmers. I built something similar(albeit more generic) using Twitter sometime back http://www.tweetrsvp.com Thanks Pretty neat work John – I would say a very handy script for freelance programmers.

I built something similar(albeit more generic) using Twitter sometime back http://www.tweetrsvp.com

Thanks

]]> Comment on Finding clients the easy way by Cliënten opsporen | Joh Man X http://johmanx.com/2010/08/finding-clients-the-easy-way/#comment-251 Cliënten opsporen | Joh Man X Sun, 12 Sep 2010 17:47:51 +0000 http://blog.lievheid.nl/?p=120#comment-251 [...] ontwikkeling van dit project is compleet beschreven op mijn weblog en dus door iedereen te gebruiken en naar wens aan te passen. Website: [...] [...] ontwikkeling van dit project is compleet beschreven op mijn weblog en dus door iedereen te gebruiken en naar wens aan te passen. Website: [...]

]]> Comment on Finding clients the easy way by Joh Man X http://johmanx.com/2010/08/finding-clients-the-easy-way/#comment-237 Joh Man X Fri, 27 Aug 2010 15:53:43 +0000 http://blog.lievheid.nl/?p=120#comment-237 Helaas ben je niet de eerste die me hierop attendeert. Neem ik mee naar de volgende post ;) Een vriend gaf al de suggestie om str_replace(array('i ',"i'"),array('I ',"I'"),$content); te doen. Gezien de disclaimer bovenaan laat ik het zo. Helaas ben je niet de eerste die me hierop attendeert. Neem ik mee naar de volgende post ;) Een vriend gaf al de suggestie om str_replace(array(‘i ‘,”i’”),array(‘I ‘,”I’”),$content); te doen. Gezien de disclaimer bovenaan laat ik het zo.

]]> Comment on Finding clients the easy way by MrThompson http://johmanx.com/2010/08/finding-clients-the-easy-way/#comment-236 MrThompson Fri, 27 Aug 2010 13:59:49 +0000 http://blog.lievheid.nl/?p=120#comment-236 Elke "i" moet caps zijn kerel ;) Elke “i” moet caps zijn kerel ;)

]]> Comment on Finding clients the easy way by Joh Man X http://johmanx.com/2010/08/finding-clients-the-easy-way/#comment-235 Joh Man X Thu, 26 Aug 2010 01:30:03 +0000 http://blog.lievheid.nl/?p=120#comment-235 Please post any replica in a comment on this page. Please post any replica in a comment on this page.

]]> Comment on Finding clients the easy way by Bloo http://johmanx.com/2010/08/finding-clients-the-easy-way/#comment-234 Bloo Wed, 25 Aug 2010 18:57:47 +0000 http://blog.lievheid.nl/?p=120#comment-234 <3 Thank you! <3 Thank you!

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