Advantages of using [] over new Array() in JavaScript
- by Alex
What are the advantages of using
var foo = [];
over using
var bar = new Array();
i've been told to use [] over new Array() but never with much explanation
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In C, do braces act as a stack frame?
- by Claudiu
If I create a variable within a new set of curly braces, is that variable popped off the stack on the closing brace, or does it hang out until the end of the function? For example: void foo() { int c[100]; { int d[200]; } //code that takes a while return; } Will d be taking up memory during the code that takes a while section?Read the article
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c declaraing varibles in blocks
- by anon
I know that in C++, I can declare variables pretty much everywhere. I recall once reading that in C, variables must be declared at the top of a function i.e. the following is invalid: void foo() { int good; if (...) { int bad; } } In the above code, is the declaraing of the bad varaible legal by C standards, or only legal due to a gcc extension? Thanks!Read the article
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How do I add my own custom attributes to existing built-in Python types? Like a string?
- by sfjedi
I want to do something like this... def helloWorld(): print "Hello world!" string.helloWorld = helloWorld "foo".helloWorld() Which would print out "Hello world!"Read the article
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PHP: Define function with variable parameter count?
- by John Isaacks
Is there a way to define a function in PHP that lets you define a variable amount of parameters? in the language I am more familiar with it is like so: function myFunction(...rest){ /* rest == array of params */ return rest.length; } myFunction("foo","bar"); // returns 2; Thanks!Read the article
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Python - Get Instance Variables
- by Chris Bunch
Is there a built-in method in Python to get an array of all a class' instance variables? For example, if I have this code: class hi: def __init__(self): self.ii = "foo" self.kk = "bar" Is there a way for me to do this: >>> mystery_method(hi) ["ii", "kk"] Thanks guys! Edit: I originally had asked for class variables erroneously. Thanks to all who brought this to my attention!Read the article
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Attribute to mark code
- by happyclicker
In c# there are attributes such as [obsolete] that create compiler warnings that will be shown in visual studio. Is there an attribute that I can use to mark a method or a class with a comment that should be shown as a warning in visual studio when I compile? Something like: [TBD(Msg="Please change me after 2010 07 20")] public void Foo(){ } or is there a possibility that I can derive from System.Attribute and make my own attribute, configuring visual studio so that it behaves as I described.Read the article
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Unreferenced Thread object dispose
- by Benny
If i use thread like this: void foo() { new Thread().Start(); } since the Thread object is not referenced, will it be disposed by GC before the designated work is done?Read the article
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Creating java class with annotated fields in runtime
- by Sarmun
The problem is that I need to create in runtime a class like this: public class Foo { @Bar int value0; @Bar int value1; @Bar int value2; .... } with number of fields being decided at runtime. I was looking at Javassist, and there you can create a new class, and add fields to it, but I haven't found a way to annotate those fields.Read the article
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Eclipse - Handling Java Exceptions like in NetBeans
- by Xorty
I recently moved from NetBeans to Eclipse and I very much miss one great feature - whenever I use method which throws some kind of exception, NetBeans alerted me and I needed to add try-catch and NetBeans automatically generated exception type for me. Is there something similiar for Eclipse? f.e. : Integer.parseInt(new String("foo")); NetBeans alerts I need to catch NumberFormatException. Eclipse doesn't alert me at all I am using Eclipse Java EE IDE for Web Developers, 3.5 - GalileoRead the article
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How do I emphasize parts of an lstlisting?
- by FredOverflow
How can I set certain parts of an lstlisting in boldface? \begin{lstlisting}[escapechar=@] fun(foo, bar, @\textbf{baz}@ ); \end{lstlisting} This compiles, but baz isn't set in boldface :( What am I missing?Read the article
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Where to keep a querystring parameter in session ?
- by hoang
Users will get to my site using a specific parameter, e.g. : http://www.mysite.com/whatever/?keepTrackOfThisValue=foo or http://www.mysite.com/who/cares/?keepTrackOfThisValue=bar I would like to store the value of this peculiar parameter in Session everytime I found it in the QueryString. I'm currently using the Session_Start event in Global.asax in order to store this but I would like to override the value each time the parameter value change, which is not possible my way. Where would you do this ?Read the article
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How to get parameter values for dm_exec_sql_text
- by Ted Elliott
I'm running the following statement to see what queries are executing in sql server: select * from sys.dm_exec_requests r cross apply sys.dm_exec_sql_text(r.sql_handle) where r.database_id = DB_ID('<dbname>') The sql text that comes back is parameterized: (@Parm0 int) select * from foo where foo_id = @Parm0 Is there any way to get the values for the parameters that the statement is using? Say by joining to another table perhaps?Read the article
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Create a Sorted Hash in Java with a Custom Comparator
- by kunjaan
I want to create a TreeMap in Java with a custom sort order. The sorted keys which are string need to be sorted according to the second character. The values are also string. Sample Hash: Za,FOO Ab,BarRead the article
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Most efficient way to search the last x lines of a file in python
- by Harley
I have a file and I don't know how big it's going to be (it could be quite large, but the size will vary greatly). I want to search the last 10 lines or so to see if any of them match a string. I need to do this as quickly and efficiently as possible and was wondering if there's anything better than: s = "foo" last_bit = fileObj.readlines()[-10:] for line in last_bit: if line == s: print "FOUND"Read the article
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Is there a way to add an onclick event to an ASP.NET Label server control?
- by fuentesjr
I wanted to do something like this: <asp:Label ID="lblMyLabel" onclick="lblMyLabel_Click" runat="server">My Label</asp:Label> I know that in Javascript I can do: <span onclick="foo();">My Label</span> So I'm wondering why I can't do that with a Label object.Read the article
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Importing files in Python from __init__.py
- by Federico Builes
Suppose I have the following structure: app/ __init__.py foo/ a.py b.py c.py __init__.py a.py, b.py and c.py share some common imports (logging, os, re, etc). Is it possible to import these three or four common modules from the __init__.py file so I don't have to import them in every one of the files? Edit: My goal is to avoid having to import 5-6 modules in each file and it's not related to performance reasons.Read the article
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why this left join query failed to load all the data in left table ?
- by lzyy
users table +-----+-----------+ | id | username | +-----+-----------+ | 1 | tom | | 2 | jelly | | 3 | foo | | 4 | bar | +-----+-----------+ groups table +----+---------+-----------------------------+ | id | user_id | title | +----+---------+-----------------------------+ | 2 | 1 | title 1 | | 4 | 1 | title 2 | +----+---------+-----------------------------+ the query SELECT users.username,users.id,count(groups.title) as group_count FROM users LEFT JOIN groups ON users.id = groups.user_id result +----------+----+-------------+ | username | id | group_count | +----------+----+-------------+ | tom | 1 | 2 | +----------+----+-------------+ where is the rest users' info? the result is the same as inner join , shouldn't left join return all left table's data? PS:I'm using mysqlRead the article
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Convert HTML DOM into a multidimensional array
- by dclowd9901
Where keys are represented by element type and values are represented by #foo and .bar (spaced and ready for explode()). Is it possible, or does something exist for it? I know that this question might incite some wrath, and I'm hoping nobody links to that post about parsing HTML, but I'm hoping it's not impossible. Thanks for the help. Addendum: Ideally, PHP would be used, since it's the only scripting language I know.Read the article
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toString() a generic type in Java
- by davidrobles
How can I print the type of a generic java type? Reflection? Any tricks? public class Foo<K> { private K element; @Override public String toString() { return "Type: " + K; } }Read the article
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Getting following exception javax.sound.sampled.LineUnavailableException: line with format ULAW 800
- by angelina
Dear All, I tried to play and get duration of a wave file using code below but got following exception.please resolve.I m using a wave file format. URL url = new URL("foo.wav"); Clip clip = AudioSystem.getClip(); AudioInputStream ais = AudioSystem.getAudioInputStream(url); clip.open(ais); System.out.println(clip.getMicrosecondLength()); **javax.sound.sampled.LineUnavailableException: line with format ULAW 8000.0 Hz, 8 bit, mono, 1 bytes/frame, not supported.**Read the article
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How do I list all classes of a given type in a python file?
- by Hobhouse
I use django, and have a lengthy models.py file. class Foo(models.Model): name = models.CharField() class Bar(models.Model): name = models.CharField() class Fab(models.Model): name = models.CharField() Is there a way to make a list of all the classes in the file which are an instance of (models.Model)?Read the article
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When are references declared in a switch statement?
- by sandis
To my surprise this code works fine: int i = 2; switch(i) { case 1: String myString = "foo"; break; case 2: myString = "poo"; System.out.println(myString); } But the String reference should never be declared? Could it be that all variables under every case always are declared no matter what, or how is this resolved?Read the article
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Using JSR 303 is it possible to generate validation.xml from annotations?
- by HappyEngineer
Let's say I have an annotation JSR 303 class like this: class A { @NotNull private String b; @Min(5) @Max(10) private int num = 3; @Pattern(regexp="[0-9]*") private String foo = "12345aa"; } How can I take that class and generate a validation.xml which contains the same constraints as those that are specified by the annotations?Read the article
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rails declarative authorization, permit all actions for controller?
- by SooDesuNe
using the delcarative_authorization gem for rails, is there a shortcut to allow a role access to all controller actions? privileges do # default privilege hierarchies to facilitate RESTful Rails apps privilege :manage, :includes => [:create, :read, :update, :delete] end isn't sufficient, because I have more controlling methods than just CRUD in my controllers. Something like: role :foo do has_permission_on :bar, :to =>[:all] end would be perfect, but I'm not finding it in the docs.Read the article
