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Questions tagged [dry]

Don't Repeat Yourself, a software development philosophy which aims at reducing redundancy and code repetition. Questions regarding how to refactor code are better suited on codereview.stackexchange.com

DRY, Don't Repeat Yourself, is a software engineering principle aimed at reducing redundancy and repetition of information of all kinds.

Note that questions regarding how to refactor code are better suited on CodeReview.

2016 questions
196
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12 answers

What's the recommended way to extend AngularJS controllers?

I have three controllers that are quite similar. I want to have a controller which these three extend and share its functions.
vladexologija
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135
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14 answers

How to repeat a "block" in a django template

I want to use the same {% block %} twice in the same django template. I want this block to appear more than once in my base template: # base.html {% block title %}My Cool Website{% endblock %} …
David Arcos
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132
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18 answers

Why is "copy and paste" of code dangerous?

Sometimes, my boss will complain to us: Why do we need such a long time to implement a feature? Actually, the feature has been implemented in another application before, you just need to copy and paste codes from there. The cost should be…
Yigang Wu
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121
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11 answers

Is duplicated code more tolerable in unit tests?

I ruined several unit tests some time ago when I went through and refactored them to make them more DRY--the intent of each test was no longer clear. It seems there is a trade-off between tests' readability and maintainability. If I leave…
Daryl Spitzer
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91
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12 answers

Java error: Implicit super constructor is undefined for default constructor

I have a some simple Java code that looks similar to this in its structure: abstract public class BaseClass { String someString; public BaseClass(String someString) { this.someString = someString; } abstract public String…
Joel
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66
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5 answers

Can I inherit constructors?

I know it's not possible to inherit constructors in C#, but there's probably a way to do what I want to do. I have a base class that is inherited by many other classes, and it has an Init method that does some initializing taking 1 parameter. All…
Alex
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57
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6 answers

How to avoid code duplication implementing const and non-const iterators?

I'm implementing a custom container with an STL-like interface. I have to provide a regular iterator and a const iterator. Most of the code for the two versions of the iterators is identical . How can I avoid this duplication? For example, my…
Adrian McCarthy
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54
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6 answers

How to elegantly symbolize_keys for a 'nested' hash

Consider the following code: hash1 = {"one" => 1, "two" => 2, "three" => 3} hash2 = hash1.reduce({}){ |h, (k,v)| h.merge(k => hash1) } hash3 = hash2.reduce({}){ |h, (k,v)| h.merge(k => hash2) } hash4 = hash3.reduce({}){ |h, (k,v)| h.merge(k…
SHS
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54
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7 answers

Where to put partials shared by the whole application in Rails?

Where would I go about placing partial files shared by more than one model? I have a page called crop.html.erb that is used for one model - Photo. Now I would like to use it for another model called User as well. I could copy and paste the code but…
Yuval Karmi
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54
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4 answers

How to make a char string from a C macro's value?

For example, how to avoid writing the 'func_name' twice? #ifndef TEST_FUN # define TEST_FUN func_name # define TEST_FUN_NAME "func_name" #endif I'd like to follow the Single Point of Truth rule. Version of C preprocessor: $ cpp --version cpp…
jfs
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53
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10 answers

Calling Django `reverse` in client-side Javascript

I'm using Django on Appengine. I'm using the django reverse() function everywhere, keeping everything as DRY as possible. However, I'm having trouble applying this to my client-side javascript. There is a JS class that loads some data depending on a…
noio
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53
votes
6 answers

DRY Ruby Initialization with Hash Argument

I find myself using hash arguments to constructors quite a bit, especially when writing DSLs for configuration or other bits of API that the end user will be exposed to. What I end up doing is something like the following: class Example …
Kyle E. Mitchell
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53
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13 answers

How much duplicated code do you tolerate?

In a recent code review I spotted a few lines of duplicated logic in a class (less than 15 lines). When I suggested that the author refactor the code, he argued that the code is simpler to understand that way. After reading the code again, I have to…
Sylvain
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52
votes
3 answers

sed command in dry run

How it is possible to make a dry run with sed? I have this command: find ./ -type f | xargs sed -i 's/string1/string2/g' But before I really substitute in all the files, i want to check what it WOULD substitute. Copying the whole directory…
dmeu
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50
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2 answers

How to reduce code duplication when dealing with recursive sum types

I am currently working on a simple interpreter for a programming language and I have a data type like this: data Expr = Variable String | Number Int | Add [Expr] | Sub Expr Expr And I have many functions that do simple things like: --…
Scott
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