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• How can I pad part of a string with spaces, in Perl?

  - by sid_com

  Hello! Which version would you prefer? #!/usr/bin/env perl use warnings; use strict; use 5.010; my $p = 7; # 33 my $prompt = ' : '; my $key = 'very important text'; my $value = 'Hello, World!'; my $length = length $key . $prompt; $p -= $length; Option 1: $key = $key . ' ' x $p . $prompt; Option 2: if ( $p > 0 ) { $key = $key . ' ' x $p . $prompt; } else { $key = $key . $prompt; } say "$key$value"

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• add objects with different name through for loop

  - by Gandalf StormCrow

  What is the best way to do the following: List<MyObject> list = new LinkedList<MyObject>(); for(int i=0; i<30;i++) { MyObject o1 = new MyObject(); list.add(o1); } But the things is I don't wanna create objects with same name, I wanna create them with different name like o1,o2,o3,o4,o5,o6,o7,o8,o9,o10 and I wanna add each to the list. What is the best way to do this ?

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• Calculate sum of objects for each unique object property in Ruby

  - by macek

  I was helping with an answer in this question and it sparked a question of my own. Pie is an object that has a pieces array made of of PiePiece objects. Each PiePiece has a flavor attribute How do I create a hash that looks like this: # flavor => number of pieces { :cherry => 3 :apple => 1 :strawberry => 2 } This works, but I think it could be improved def inventory hash = {} pieces.each do |p| hash[p.flavor] ||= 0 hash[p.flavor] += 1 end hash end Any ideas?

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• Which Browsers don't support ids for in page navigation (fragid)?

  - by dshaw

  In HTML5, name is no longer a valid attribute of the anchor tag (<a name="yadayada">). It has been mentioned that older browsers do not recognize the the new recommended approach (<a id="yadaya"> or any id for that matter). What are the browsers which don't recognize ids for in page navigation (fragids)? Are we talking about Netscape-era browsers or the usual suspect, Internet Explorer 6?

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• Confusing If Statement?

  - by NetSide

  I always use If statement (In C#) as (1. Alternative); if (IsSuccessed == true) { // } I know that there is no need to write "== true" as (2. Alternative)); if (IsSuccessed) { // } But, I use it because it is more readable and cause no performance issue. Of course, this is my choice and I know many software developers prefer first alternative. What is the best usage, and Why?

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• What to do if 2 (or more) relationship tables would have the same name?

  - by primehunter326

  So I know the convention for naming M-M relationship tables in SQL is to have something like so: For tables User and Data the relationship table would be called UserData User_Data or something similar (from here) What happens then if you need to have multiple relationships between User and Data, representing each in its own table? I have a site I'm working on where I have two primary items and multiple independent M-M relationships between them. I know I could just use a single relationship table and have a field which determines the relationship type, but I'm not sure whether this is a good solution. Assuming I don't go that route, what naming convention should I follow to work around my original problem?

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• Fastest way to convert a binary file to SQLite database

  - by chown

  I've some binary files and I'm looking for a way to convert each of those files to a SQLite database. I've already tried C# but the performance is too slow. I'm seeking an advice on how and what programming language should be the best to perform this kind of conversion. Though I prefer any Object Oriented Language more (like C#, Java etc), I'm open for any programming language that boosts up the conversion. I don't need a GUI frontend for the conversion, running the script/program from console is okay. Thanks in advance

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• Is it wrong for a context (right click) menu be the only way a user can perform a certain task?

  - by Eric

  I'd like to know if it ever makes sense to provide some functionality in a piece of software that is only available to the user through a context (right click) menu. It seems that in most software I've worked with the right click menu is always used as a quick way to get to features that are otherwise available from other buttons or menus. Below is a screen shot of the UI I'm developing. The tree view on the right shows the user's library of catalogs. Users can create new catalogs, or add and remove existing catalogs to and from their library. Catalogs in their library can then be opened or closed, or set to read-only. The screen shot shows the context menu I've created for the browser. Some commands can be executed independently from any specific catalog (New, Add). Yet the other commands must be applied to a specifically selected catalog (Close, Open, Remove, ReadOnly, Refresh, Clean UP, Rename). Currently the "Catalog" menu at the top of the window looks identical to this context menu. Yet I think this may be confusing to the users as the tree view which shows the currently selected catalog may not always be visible. The user may have switched to the Search or Filters tab, or the left pane may be hidden entirely. However, I'm hesitant to change the UI so that the commands that depends on a specifically selected catalog are only available through the context menu.

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• Implementing prompts in text-input

  - by AntonAL

  Hi, I have a form with some text-inputs: login, password. If user sees this form the first time, input-texts should "contain" prompts, like "enter login", "enter password". If user clicks text-input, it's prompt should disappear to allow typing. I have seen various examples, that uses background image with prerendered text on it. Those images are appearing with following jQuery: $("form > :text").focus(function(){ // hide image }).blur(function(){ // show image, if text-input is still empty if ( $(this).val() == "" ) // show image with prompt }); This approach has following problems: localization is impossible need to pre-render images for various textual prompts overhead with loading images How do you overcomes such a problems ?

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• enableviewstatemac=true

  - by domineer

  Does setting enableviewstatemac to "true" affects the site's performance? Could you give me some explanation?

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• Are there possible approaches to map signal handling (c library) into a c++ exception?

  - by pcent

  I have a c++ application linked against some c libraries. Are there possible approaches to encapsulate the signal handling in a C++ class, so it could be handled as a c++ exception?

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• int foo(type& bar); is a bad practice?

  - by Earlz

  Well, here we are. Yet another proposed practice that my C++ book has an opinion on. It says "a returning-value(non-void) function should not take reference types as a parameter." So basically if you were to implement a function like this: int read_file(int& into){ ... } and used the integer return value as some sort of error indicator (ignoring the fact that we have exceptions) then that function would be poorly written and it should actually be like void read_file(int& into, int& error){ } Now to me, the first one is much clearer and nice to use. If you want to ignore the error value, you do so with ease. But this book suggests the later. Note that this book does not say returning value functions are bad. It rather says that you should either only return a value or you should only use references. What are your thoughts on this? Is my book full of crap? (again)

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• What would be the best way to store the questions and responses for a survey where I need to keep th

  - by Ian Roke

  Background I am writing a survey that is going to a large audience. It contains 15 questions and there are five possible answers to each question along with potential comments. The user can cycle through all 15 questions answering them in any order and is allowed to leave the survey at any point and return to answer the remaining questions. Once an answer has been attempted on all 15 questions a submit button appears which allows them to submit the questions as final answers. Until that stage all answers are required to be retrievable whenever the user loads the survey page up. The requirement is that the user only sees one question on a page and 'Previous' and 'Next' buttons allow the user to scroll through the questions. Requirement I could request the question each time the user clicks a button and save the current response and so on but that would be a large number of hits to a database that is already heavily used. I don't have the time to procure a new server etc so I have to make do with what I have. Is there any way I can cache the questions on the user machine and/or responses? Obviously I need the response data to be secure and only known to the user so I feel a little bit stuck as for the best way of doing this. Any pointers? I am prepared to offer a bounty of 100 points on this question if it means I get some good quality discussion and feedback going.

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• Should I use an interface or factory (and interface) for a cross-platform implementation?

  - by nbolton

  Example A: // pseudo code interface IFoo { void bar(); } class FooPlatformA : IFoo { void bar() { /* ... */ } } class FooPlatformB : IFoo { void bar() { /* ... */ } } class Foo : IFoo { IFoo m_foo; public Foo() { if (detectPlatformA()} { m_foo = new FooPlatformA(); } else { m_foo = new FooPlatformB(); } } // wrapper function - downside is we'd have to create one // of these for each function, which doesn't seem right. void bar() { m_foo.bar(); } } Main() { Foo foo = new Foo(); foo.bar(); } Example B: // pseudo code interface IFoo { void bar(); } class FooPlatformA : IFoo { void bar() { /* ... */ } } class FooPlatformB : IFoo { void bar() { /* ... */ } } class FooFactory { IFoo newFoo() { if (detectPlatformA()} { return new FooPlatformA(); } else { return new FooPlatformB(); } } } Main() { FooFactory factory = new FooFactory(); IFoo foo = factory.newFoo(); foo.bar(); } Which is the better option, example A, B, neither, or "it depends"?

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• Clarifying... So Background Jobs don't Tie Up Application Resources (in Rails)?

  - by viatropos

  I'm trying to get a better grasp of the inner workings of background jobs and how they improve performance. I understand that the goal is to have the application return a response to the user as fast as it can, so you don't want to, say, parse a huge feed that would take 10 seconds because it would prevent the application from being able to process any other requests. So it's recommended to put any operations that take more than say 500ms to execute, into a queued background job. What I don't understand is, doesn't that just delay the same problem? I know the user who invoked that background job will get an immediate response, but what if another user comes right when that background job starts (and it takes 10 seconds to finish), wont that user have to wait? Or is the main issue that, requests are the only thing that can happen one-at-a-time, while on the other hand a request can start while one+ background jobs are in the middle of running? Is that correct?

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• Shall I prefer constants over defines?

  - by Helper Method

  In C, shall I prefer constants over defines? I've reading a lot of code lately, and all of the examples make heavy use of defines.

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• Where to keep config data other than config file (Windows App)?

  - by user144842

  My Windows application GUI is accepting some required application configuration fields from the user. I need to store them of course, but I wanna hide these fields from the user. I cannot use database to store these configs. I want to avoid using app.config either. (No app.config encryption) Any suggestions, Where and in which format i should store fields. (Field example is: Accepting database User credentials, Task Schedule info etc.)

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• When should methods be made private?

  - by AaronSzy

  There are lots of times where i'm not sure whether a particular method should be made private or not. For example, i'm building a class right now, which, is responsible for generating a report. This class has a buildReport method and several methods which collect the necessary data for buildReport. // single public method // uses a set of helper methods public buildReport() // helper methods private avgSurveyTime() private fetchVendors() private fetchSendCounts() private ... Im debating whether i should make these helper methods public. The only method i really plan on calling outside at the moment is buildReport. However, it might be useful to get just a list of the vendors with fetchVendors etc. I see two schools of thought on this: You can always expose as little as possible. (In which case, many of my classes would only have one public method) OR you can expose all you can that might be useful to the user of the class. Is there a good rule of thumb to use for deciding when methods should be made public/private?

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• Do we still need backup code for people who have javascript disabled?

  - by SLC

  I hear about it a bit in tutorials that I watch, that certain things won't work if javascript is disabled. Occasionally I see workarounds. The question is, are these relevent? I can't imagine anyone not having a javascript enabled browser nowadays, except the most ancient of phones, and chances are your page won't render on them properly anyway. Do people still bother to write backup code for javascript being disabled?

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• How to set ID of item when the item is not yet created..?

  - by hoppl

  I'll try to make myself clear with an example: Imagine an admin page to add a product to a database (product list). When I open the ADD ITEM page, the item is not yet created (not until I click the submit button), but let's say I want to add categories this product will appear in (with AJAX for example). When I run the AJAX script, i need to tell it which ID (my product) to put these categories in... How should I do this.? Is inserting a blank item in the database (to get mysql_insert_id) when the page opens a good way to do this.? Is it prone to conflicts or errors..? How do you guys do it.?

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• Private vs. Public members in practice (how important is encapsulation?)

  - by Asmor

  One of the biggest advantages of object-oriented programming is encapsulation, and one of the "truths" we've (or, at least, I've) been taught is that members should always be made private and made available via accessor and mutator methods, thus ensuring the ability to verify and validate the changes. I'm curious, though, how important this really is in practice. In particular, if you've got a more complicated member (such as a collection), it can be very tempting to just make it public rather than make a bunch of methods to get the collection's keys, add/remove items from the collection, etc. Do you follow the rule in general? Does your answer change depending on whether it's code written for yourself vs. to be used by others? Are there more subtle reasons I'm missing for this obfuscation?

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• Shoud a method that waits for a change of state be const?

  - by Space_C0wb0y

  In a multithreaded scenario, I have a method like this: bool WaitForChange( time_duration WaitTime ) const; This method waits either until the state of the object has changed and returns true, or until the timeout times out (how do you say that?) and returns false. My intuition is, that const is to protect against unwanted side-effects of the method itself, so this is fine. But then again, some user might think that the state of the could not have changed, since the method is declared const. Is that user stupid, or should I make the method non-const in order to avoid confusion?

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• Cluttered code (almost complete): refactor it now or later?

  - by Jorge

  I have a very cluttered code, and the current revision is almost complete, meaning all functionalities i wanted for this revision/sprint are done. Should i finish this revision as it is and refactor it later or should i refactor it right now?

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• How much slower is a try/catch block? [closed]

  - by Euclid

  Possible Duplicate: What is the real overhead of try/catch in C#? how much slower is a try catch block than a conditional? eg try { v = someArray[10]; } catch { v = defaultValue; } or if (null != someArray) { v = someArray[10]; } else { v = defaultValue; } is there much in it or isn't there a definative performance differance?

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• Which function should i use for testin if a var isset or not?

  - by streetparade

  I'm sometimes confused to using which one of them, say i have a function called getmember($id) function getmember($id) { // now this is the confusing part // how do i test if a $id was set or not set? //solution 1 if(empty($id)) { return false; } // solution 2 if(isset($id)) { return false; } } Thats sometimes not clear tome some times if a parameter in a function is set like function($var="") Then i do if($var ==="") { return false; } What should i use the next time isset ? emtyp ? or ===''

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