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4
votes
1answer
98 views

(jQuery) What is wrong with methods such as .append?

tl;dr: What is wrong with the efficiency of methods such as .append() and what can be alternatives to this? Explanation: Hello everyone. I occasionally have to build A/B tests for websites, which ...
1
vote
2answers
124 views

How does Yahoo's Smush.It work and why doesn't everyone use it?

I've recently come across an application by Yahoo called SmushIt. Apparently it does lossless compression on images. Sometimes the image size is reduced by as much as 90%. This of course has major ...
9
votes
5answers
2k views

Is try-finally expensive

In case of code where you have to do a resource cleanup before exiting a function, is there a major performance difference between these 2 ways of doing it. Cleaning the resource before every return ...
1
vote
1answer
184 views

Efficiency of C# dictionaries

C# dictionaries are a simple way to find if something exists etc etc. I have a question though on how they work. Let's say instead of a dictionary I use an ArrayList. Instead of using ContainsKey (or ...
1
vote
1answer
22 views

Should I do a different SQL table for user privacy settings or just keep it at the users table?

So I am developing a Web Application and I have some concerns about the database. I use a lot of boolean settings at the user table with the form privacy_allow_1, privacy_allow_that, ...
0
votes
1answer
92 views

How can I approach creating an efficient algorithm for maximizing value with these specific constraints?

I'm having trouble coming up with an approach that isn't n^2 for this problem. Here's a contrived, simplified version I've come up with: Let's say you're a company that needs 4 employees to launch in ...
3
votes
1answer
76 views

How do I efficiently send notifications for different events to different users based on their preferences?

I'm creating a notification system for particular events. A user can set the criteria that match particular events (ie. New item, changed item, closed item etc) Items have different characteristics ...
0
votes
3answers
159 views

Using action array vs Switch Case [closed]

I have an occasion of code in which I will draw a different set of buttons in a screen (depending on the number of the buttons). One thought (and my current implementation) is to use an action array ...
2
votes
2answers
181 views

Most efficient way to store this collection of moduli and remainders?

I have a huge collection of different moduli and associated with each modulus a fairly large list of remainders. I want to store these values so that I can efficiently determine whether an integer is ...
1
vote
1answer
33 views

Custom Domain or Attribute Reference Table or Both?

I'm designing my first real database and I'm weighing the pros and cons of how to enforce uniformity in my data. My first option is to create a custom domain and program my UI to only allow certain ...
7
votes
3answers
340 views

Computed Values and Simple Reads - A nagging pain for my Domain Driven Designs!

The problem I continually face is how to deal with computed values driven by domain logic while still working efficiently against the data store. Example: I'm returning a list of Products from my ...
4
votes
2answers
2k views

Amortized Analysis? (Worst-case Performance Guarantees)

What is Amortized Analysis? And how can it help me achieve worst-case performance guarantees in my programs? I was reading that the following techniques can help the programmer achieve Worst-case ...
11
votes
6answers
7k views

Is there any reason to use varchar over text columns in a database?

Is varchar just a remnant from before text came around, or are there use cases where you would want to use a varchar? (Or char for that matter..) (I use Postgres and MySQL (MyISAM) daily, so those ...
0
votes
3answers
150 views

What is more efficient, a single square root or multiple divisions?

Say I make a program that calculates all possible (integral) factors of a certain number that has been input. Is it theoretically more efficient to check with all integers up to the square root of ...
7
votes
8answers
9k views

What is the best way to INSERT a large dataset into a MySQL database (or any database in general)

As part of a PHP project, I have to insert a row into a MySQL database. I'm obviously used to doing this, but this required inserting into 90 columns in one query. The resulting query looks horrible ...
1
vote
2answers
321 views

How to approach program design with respect to data strucutres and algorimths - is there an equivelant of the OO design process for d.s.'s + algs? [closed]

My applogies for probably the worst written body of text I have produced in my life and many thanks to those willing to plough through it all. I was (and still am) not able to clearly express what I ...
0
votes
2answers
112 views

Should you avoid adding unecessary stack frames?

I have been working with laravel (PHP) recently, and there is an option when using their fluent ORM to define where clauses using closures. This gives us two, functionally equivalent, ways to specify ...
26
votes
10answers
4k views

When I test out the difference in time between shifting and multiplying in C, there is no difference. Why?

I have been taught that shifting in binary is much more efficient than multiplying by 2^k. So I wanted to experiment, and I used the following code to test this out: #include <time.h> #include ...
20
votes
4answers
21k views

Is Python Interpreted or Compiled?

This is just a wondering I had while reading about interpreted and compiled languages. Ruby is no doubt an interpreted language, since source code is compiled by an interpreter at the point of ...
0
votes
0answers
31 views

Are Components ideal for packaging and reusing find() requests?

I find myself loading several models over and over again throughout my application. Instead of typing the code to load the model, run a find, would it be reasonable to put that code in a method and ...
3
votes
2answers
77 views

Trivially Sortable Encoding for Arbitrary-Precision Decimals

I'm looking for a reasonably(*) space-efficient way to encode arbitrary-precision decimals (e.g. BigDecimal), such that when sorting the bit-pattern of the encodings lexicographically, the numbers ...
2
votes
5answers
284 views

Simplicity-efficiency tradeoff

The CTO called to inform me of a new project and in the process told me that my code is weird. He explained that my colleagues find it difficult to understand due to the overly complex, often new ...
1
vote
3answers
202 views

Is there a difference in resource allocation & efficiency between a web app and a compiled one? [closed]

I'm a web developer. I feel like I develop less resource-intensive functionality often times, because I have this feeling that if I ask too much of the web app (animation, calculation, connections, ...
-1
votes
1answer
186 views

How to code efficiently? [duplicate]

I often compare my code to others and I find their solution more efficient and shorter than mine. Although both solutions work, I can't help it but wonder if mine is not adequate enough. As a result, ...
0
votes
1answer
53 views

Replacing string comparisons with dictionary lookups

Given 2 strings s1 and s2, if I do a simple equality check , it is considered to be O(n) when calculating algorithm efficiency. So, if I am using a brute force approach for the rotated substring ...
0
votes
1answer
114 views

How to Learn Doing it Right Way? [closed]

I am self taught web developer. I do not have any computer science degree from university. I know HTML5, CSS3, Javascript, PHP and some Python. But I am having difficulties about being efficient. When ...
7
votes
2answers
296 views

What is an efficient algorithm for randomly assigning a pool of objects to a parent using specific rules

I need some expert answers to help me determine the most efficient algorithm in this scenario. Consider the following data structures: type B { A parent; } type A { set<B> children; ...
0
votes
3answers
334 views

Least Change Problem with Thousands of Denominations

In a hypothetical economy there are currency units that can represent thousands of different values. So, for example there might be coins worth 1c, 3c, 5c, 7c, 7.5c, 80c, 8001.5c etc. Given a list of ...
0
votes
1answer
41 views

lots of images and ajax, or better solution?

I have a control where the user can select a value for the x and y axis from 2 dropdowns, and then there is a 4 by 4 grid (an image) which will show what their selections correspond to (updating ...
5
votes
3answers
5k views

Quickest way to split a delimited String in Java

I am building a Comparator that provides multi-column sort capability on a delimited String. I am currently using the split method from String class as my preferred choice for splitting the raw String ...
0
votes
2answers
341 views

Quick algorithm to find matches between two arrays

I'm faced with the following problem: I have an array which is produced by the parsing of a yaml file which contains patterns in the following structure. "Programming books" Title: a ...
0
votes
1answer
60 views

How to prevent re-checking already-checked data?

I have a class with a validId($id) method that is called by the constructor and by public function load($id). The method queries the database to see if the id exists and returns true/false. The ...
9
votes
5answers
623 views

Can a pure-functional solution to this problem be as clean as the imperative?

I have an exercise in Python as follows: a polynomial is given as a tuple of coefficients such that the powers are determined by the indexes, e.g.: (9,7,5) means 9 + 7*x + 5*x^2 write a function to ...
0
votes
1answer
101 views

Are expensive operations for a user bad for other users?

Let's say user A does something expensive (regarding CPU and/or memory), which takes a few seconds. Concurrently, user B needs a very small amount of computing time. In this case, will the computing ...
1
vote
2answers
198 views

Making an algorithm more efficient

I have a question about the efficiency of an algorithm: You have a list of x,y points Now I want to get all the points that are up to 5 units away from a reference x,y point How do you calculate it ...
0
votes
1answer
112 views

Is creating a separate pool for each individual png image in the same class appropriate?

I'm still possibly a little green about object-pooling, and I want to make sure something like this is a sound design pattern before really embarking upon it. Take the following code (which uses the ...
1
vote
3answers
723 views

Storing a value vs calling reference for repeated use in Java

I have an old habit of avoiding calling references multiple times, both for easier to read/maintain code, and for possible efficiency. But I'm wondering which is more efficient (memory, performance, ...
4
votes
2answers
578 views

How much logic can be put into an object-pooling factory class before it does more harm than good?

The main language I'm interested in doing object pooling in is AS3, which is known to need it in many cases. In the past I've always made a brand new factory class for every type I was going to try ...
6
votes
5answers
417 views

Maintaining good form while learning new technologies

I find that I have to learn new technologies fairly regularly as a contractor in order to keep competitive. However, I also find that (not only, but especially) in these circumstances, I tend to end ...
2
votes
2answers
343 views

When is a code considered tight and how does it increase efficiency of the code?

I have read many times that insertion sort has tight code and hence the hidden constant factor in its asymptotic complexity is smaller. I just read yesterday that quick sort has tight code just like ...
7
votes
4answers
629 views

Interrupting Work Productivity: The Name? [closed]

Certainly it is a productivity killer when a developer is constantly interrupted by other workers, bosses, etc - but it is even worse when the developer is constantly interrupted by his or her own ...
5
votes
4answers
570 views

How do you keep track of what stage you are at in a program? [closed]

Like many, I'm developing a couple of applications on my own (not at the same time) to eventually sell. But I also have websites to run, college work and a social life etc., so often I can forgot what ...
17
votes
7answers
2k views

Does modular programming affect computation time?

Everyone says that I should make my code modular, but isn't it less efficient if I use more method calls rather than fewer, but larger, methods? What is the difference in Java, C, or C++ for that ...
6
votes
6answers
5k views

Why is binary search,which needs sorted data, considered better than linear search?

I have always heard that linear search is a naive approach and binary search is better than it in performance due to better asymptotic complexity. But I never understood why is it better than linear ...
3
votes
1answer
195 views

Processing every leaf under a node in a tree efficiently

Short version: In a tree (non-binary) with many levels of children, where each node can have multiple leaves, what is the best way to tally leaves that meet a certain condition given a node? Long, ...
11
votes
3answers
583 views

Do teams get more productive by adding more developers? [duplicate]

Suppose you've got a project that is running late. Is there any proof or argument that teams become much more productive by adding more people? I am looking for answers that can be supported by facts ...
36
votes
9answers
3k views

Why not have a High Level Language based OS? Are Low Level Languages more efficient?

Without being presumptuous, I would like you to consider the possibility of this. Most OS today are based on pretty low level languages (mainly C/C++) Even the new ones such as Android uses JNI & ...
1
vote
1answer
329 views

Can web apps allow fast data-typists to “type-ahead”?

In some data entry contexts, I've seen data typists, type really fast and know so well the app they use, and have a mechanic quality in their work so that they can "type ahead", ie continue typing and ...
18
votes
4answers
552 views

Educational, well-written FOSS projects to read, study or discuss [closed]

Before you say it: yes, this "question" has been asked other times. However, I could not fine many of such questions and not that easily, and those I found had similar results. What I'm trying to say ...
41
votes
10answers
2k views

Is there any hard data on the (dis-)advantages of working from home? [closed]

Is there any hard data (studies, comparisons, not-just-gut-feel analysis) on the advantages and disadvantages of working from home? My devs asked about e.g. working from home one day per week, the ...