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  • Javascript for loop efficiency

    - by Misha Moroshko
    Is for (var i=0, cols=columns.length; i<cols; i++) { ... } more efficient than for (var i=0; i<columns.length; i++) { ... } ? In the second variant, is columns.length calculated each time the condition i<columns.length is checked ?

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  • How do I write a writer method for a class variable in Ruby?

    - by tepidsam
    I'm studying Ruby and my brain just froze. In the following code, how would I write the class writer method for 'self.total_people'? I'm trying to 'count' the number of instances of the class 'Person'. class Person attr_accessor :name, :age @@nationalities = ['French', 'American', 'Colombian', 'Japanese', 'Russian', 'Peruvian'] @@current_people = [] @@total_people = 0 def self.nationalities #reader @@nationalities end def self.nationalities=(array=[]) #writer @@nationalities = array end def self.current_people #reader @@current_people end def self.total_people #reader @@total_people end def self.total_people #writer #-----????? end def self.create_with_attributes(name, age) person = self.new(name) person.age = age person.name = name return person end def initialize(name="Bob", age=0) @name = name @age = age puts "A new person has been instantiated." @@total_people =+ 1 @@current_people << self end

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  • Is it possible to open a pipe-based filehandle which prints to a variable in perl?

    - by blackkettle
    Hi, I know I can do this, ------ open(F,"",\$var); print F "something cool"; close(F); print $var; ------ or this, open(F, "| ./prog1 | ./prog2 tmp.file"); print F "something cool"; close(F); but is it possible to combine these? The semantics of what I'd like to do should be clear from the following, open(F,"|./prog1 | ./prog2", \$var); print F "something cool"; close(F); print $var; however the above clearly won't work. A few minutes of experimenting and googling seems to indicate that this is not possible, but I'd like to know if I'm stuck with using the `` to capture the output.

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  • get an id of child element and store in a variable using jquery?

    - by Simpson88Keys
    I'm basically trying to do exactly what the subject suggests, but I'm getting "undefined" in my alert, and I'm not entirely sure why. I am fairly new to jquery, so, I probably have the syntax wrong, but not sure where to go from here. I'll post both of my attempts, which both yield "undefined" in the alert... //In my first attempt, I'm trying to get the id of the inner a tag <ul> <li id="l1" class="active"><a href="#c1">Samp 1</a></li> <li id="l2" class=""><a href="#c2">Samp 2</a></li> <li id="l3" class=""><a href="#c3">Samp 3</a></li> </ul> var selected = $(".active).children("a").attr("id"); alert(selected); //In my second attempt, I'm trying to get the id of the currently selected li var selected = $(".active").attr("id"); alert(selected);

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  • How to test that variable is not equal to multiple things? Python

    - by M830078h
    This is the piece of code I have: choice = "" while choice != "1" and choice != "2" and choice != "3": choice = raw_input("pick 1, 2 or 3") if choice == "1": print "1 it is!" elif choice == "2": print "2 it is!" elif choice == "3": print "3 it is!" else: print "You should choose 1, 2 or 3" While it works, I feel that it's really clumsy, specifically the while clause. What if I have more acceptable choices? Is there a better way to make the clause?

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  • C++ Variable declarable in function body, but not class member?

    - by anon
    I want to create a C++ class with the following type: It can be declared inside of a function. It can be declared inside of a member function. It can not be declared as a class member. The use of this: think "Root" objects for a GC. Is this possible in C++? In particular, I'm using g++. Willing to switch to clang. Either templates or macro solution fine. Thanks!

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  • Printing Variable names and contents as debugging tool; looking for emacs/Python shortcut

    - by Schof
    I find myself adding debugging "print" statements quite often -- stuff like this: print("a_variable_name: %s" % a_variable_name) How do you all do that? Am I being neurotic in trying to find a way to optimize this? I may be working on a function and put in a half-dozen or so of those lines, figure out why it's not working, and then cut them out again. Have you developed an efficient way of doing that? I'm coding Python in Emacs.

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  • How can i use a variable created in a objective c Void function?

    - by James
    Im trying to get the lat and long values generated in a void function and use them within another function. Any help grateful. (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation { float latDeg = newLocation.coordinate.latitude; NSLog(@"Lat: %g", latDeg); float longDeg = newLocation.coordinate.longitude; NSLog(@"Lat: %g", longDeg); } I want to use the latDeg and longDeg variables.

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  • C++: Simple data type for a variable in IF statement?

    - by Jason
    I am new to C++ and am making a simple text RPG, anyway, The scenario is I have a "welcome" screen with choices 1-3, and have a simple IF statement to check them, here: int choice; std::cout << "--> "; std::cin >> choice; if(choice == 1) { //.. That works fine, but if someone enters a letter as selection (instead of 1, 2 or 3) it'll become "-392493492"or something and crash the program. So I came up with: char choice; std::cout << "--> "; std::cin >> choice; if(choice == 1) { //.. This works kinda fine, but when I enter a number it seems to skip the IF statements completely.. Is the char "1" the same as the number 1? I get a compiler errro with this (ISO-CPP or something): if(choice == "1") So how on earth do I see if they entered 1-3 correctly!?

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  • how to get the exact mouse click position with support for variable screen resolution ?

    - by javadahut
    I'm writing a simple macro program: you record your mouse or keyboard movements, you save the file, and the program will run it for you on your pc computer. however, the situation is, what if the file is run on a laptop where the resolution is smaller? what if the file is to be run on a web server where there is no monitor ? ie) the button is clicked at position (x,y): 300,520 but the button will be at another location in a different monitor resolution. How would you approach this problem ?

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  • How do I add an object to a binary tree based on the value of a member variable?

    - by Max
    How can I get a specific value from an object? I'm trying to get a value of an instance for eg. ListOfPpl newListOfPpl = new ListOfPpl(id, name, age); Object item = newListOfPpl; How can I get a value of name from an Object item?? Even if it is easy or does not interest you can anyone help me?? Edited: I was trying to build a binary tree contains the node of ListOfPpl, and need to sort it in the lexicographic. Here's my code for insertion on the node. Any clue?? public void insert(Object item){ Node current = root; Node follow = null; if(!isEmpty()){ root = new Node(item, null, null); return; }boolean left = false, right = false; while(current != null){ follow = current; left = false; right = false; //I need to compare and sort it if(item.compareTo(current.getFighter()) < 0){ current = current.getLeft(); left = true; }else { current = current.getRight(); right = true; } }if(left) follow.setLeft(new Node(item, null, null)); else follow.setRight(new Node(item, null, null)); }

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  • jQuery: Quick question. How to select string variable?

    - by user317563
    Hello world, EDIT: I would like to avoid doing something like this: var str = 'Hello'; if ( str == 'Hello') { alert(str); } I would rather do: var str = 'Hello'; $(str).filter(':contains("Hello")').each(function(){ alert(this) }); I've tried a lot of things: $(str).text().method1().method2().method3(); $(str).val().method1().method2().method3(); $(str).contents().method1().method2().method3(); Nothing worked. Is it possible to do this? Thank you for your time. Kind regards, Marius

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  • asp.net mvc 2 multithread

    - by Chris Cap
    I'm getting some weird behavior in asp.net MVC2 (at least it's not what I'm expecting). I have a controller httppost action that processes credit cards. I'm setting a session variable on the server to let me know if a user has attempted to process a card. I clear that session variable when I'm done. I am doing some very quick posts to test the process and the session variable is coming back null everytime because I clear the session variable at the end of the process. I have some debug prints that show me that the all requests are processed synchronously. That is...the first attempt occurs, it fails, session variable is cleared, second attempt tries and fails and the variable is cleared, etc... My first thought was that this was a side effect of debugging and that it just lined requests up for debugging purposes using the local webserver. So I put it on a development server and the same thing is occurring. Multiple submits/posts are processed synchronously. I even put a System.Threading.Sleep in there to make sure it would stop right after I set the session variable and it still won't even START the second request until the first is done. Has anyone else seen this behavior? My understanding was that a worker process was spawned for each request and that these actions could happen asychronously. Here's some psuedo code if (Session["CardCharged"] != null) return RedirectToAction("Index", "Problem"); Session["CardCharged"] = false; //starting the process System.Threading.Thread.Sleep(10000); //charge card here if (!providerResponse.IsApproved) { System.Diagnostics.Debug.WriteLine("failed"); Session["CardCharged"] = null; //have to allow them to charge again since this failed return View(myModel); } Session["CardCharged"] = true; return RedirectToAction("Index", "OrderComplete"); I should mention that my code ALWAYS fails the credit card check for testing purposes. I'm trying to test the situation where processing is STILL occurring and redirect the user elsewhere. I have set a dummy session variable elsewhere to assure that the session id "sticks". So I know the session id is the same for each request. Thanks

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  • What is wrong in this simple Makefile

    - by Walidix
    SRC_VAR = test string for variable manipulation. TEST1_VAR = $(subset for,foo,${SRC_VAR}) all: @echo original str: ${SRC_VAR} @echo substitution: ${TEST1_VAR} This is the output: original str: test string for variable manipulation. substitution: The output should be: original str: My test string for variable manipulation. substitution: My test string foo variable manipulation.

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  • js code works for one variable(?), how to make it work for many?

    - by jerry87
    I have working code of js, it shows different div for selected option. <html> <head> <script src="http://code.jquery.com/jquery-latest.js"></script> <script type="text/javascript"> $(document).ready(function(){ $('#box1').hide(); $('#box2').hide(); $('#box3').hide(); $("#thechoices").change(function(){ $("#" + this.value).show().siblings().hide(); }); $("#thechoices").change(); }); </script> </head> <body> <select id="thechoices"> <option value="box1">Box 1</option> <option value="box2">Box 2</option> <option value="box3">Box 3</option> </select> <!-- the DIVs --> <div id="boxes"> <div id="box1"><p>Box 1 stuff...</p></div> <div id="box2"><p>Box 2 stuff...</p></div> <div id="box3"><p>Box 3 stuff...</p></div> </div> </body> </html> Please, I have no js experience, so I don't know how to make it work several times on one page for many "thechoices". Something like copy paste but more suitable than this: <script type="text/javascript"> $(document).ready(function(){ $('#box1').hide(); $('#box2').hide(); $('#box3').hide(); $('#box4').hide(); $('#box5').hide(); $('#box6').hide(); $("#thechoices").change(function(){ $("#" + this.value).show().siblings().hide(); }); $("#thechoices2").change(function(){ $("#" + this.value).show().siblings().hide(); }); $("#thechoices").change(); }); $("#thechoices2").change(); }); </script> </head> <body> <select id="thechoices"> <option value="box1">Box 1</option> <option value="box2">Box 2</option> <option value="box3">Box 3</option> </select> <!-- the DIVs --> <div id="boxes"> <div id="box1"><p>Box 1 stuff...</p></div> <div id="box2"><p>Box 2 stuff...</p></div> <div id="box3"><p>Box 3 stuff...</p></div> </div> <select id="thechoices2"> <option value="box4">1</option> <option value="box5">2</option> <option value="box6">3</option> </select> <!-- the DIVs --> <div id="boxes"> <div id="box4"><p>1 stuff...</p></div> <div id="box5"><p>2 stuff...</p></div> <div id="box6"><p>3 stuff...</p></div> </div> I know you can help me, it seems to be simple but I can't handle with this. How can I change my second code to work in the same way but not only for two selectors. I need it for many. Don't want to copy paste the same section like in my second code.

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  • Is there a straightforward way to have a thread-local instance variable?

    - by Dan Tao
    With the ThreadStatic attribute I can have a static member of a class with one instance of the object per thread. This is really handy for achieving thread safety using types of objects that don't guarantee thread-safe instance methods (e.g., System.Random). It only works for static members, though. Is there any straightforward way to declare a class member as thread-local, meaning, each class instance gets an object per thread?

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  • How do you keep the value of global variables (namely a struct variable) between postbacks?

    - by user3702304
    I'm new to this and have already searched for this with not much luck :( Lets say I have defined a struct array globally and filled the array with data on an Ajax ModalPopupExtender. I then have a ddl_SelectedIndexChanged event that does a postback and seems to recycle my array. Is there a way to fire the ddl_SelectedIndexChanged event to perform some code without doing a postback? Or is there an easy way to make the array of type struct retain it's values? (I am creating a website btw) Thanks in advance...

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  • How to run jQuery onClick? Need to pass a variable to run .ajax

    - by user205307
    I'm trying to run .ajax and insert a data element from the onClick of an item from the page. Whats the best way to do this? Something like this: function grabinfo(foo){ $.ajax({ url: "infospitter", method: "GET", data: "id="+foo, success: function(html){ $(#showstuff).html(html); } }); } <input onClick="javascript:grabinfo(18343)" /> // and on page each item will have this button input

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