![]() DIY HOW TO MAKE A COMPUTER PROGRAM SOFTWAREAHA programming assumes that both WET and DRY solutions inevitably create software that is rigid and difficult to maintain. Thus, engineers tend to continue to iterate on the same abstraction each time the requirement changes. ![]() ĪHA is rooted in the understanding that the deeper the investment we've made into abstracting a piece of software, the more we perceive that the cost of that investment can never be recovered ( Sunk cost fallacy). and was influenced by Sandi Metz's "prefer duplication over the wrong abstraction". Dodds as optimizing for change first, and avoiding premature optimization. AHA stands for " Avoid Hasty Abstractions", described by Kent C. ![]() AHA Īnother approach to abstractions is the AHA principle. Kevin Greer named and described this programming principle. A DRY approach eliminates that redundancy by using frameworks that reduce or eliminate all those editing tasks except the most important ones, leaving the extensibility of adding new knowledge variables in one place. The text string "comment" might be repeated in the label, the HTML tag, in a read function name, a private variable, database DDL, queries, and so on. WET solutions are common in multi-tiered architectures where a developer may be tasked with, for example, adding a comment field on a form in a web application. The opposing view to DRY is called WET, a backronym commonly taken to stand for "write everything twice" (alternatively "write every time", "we enjoy typing" or "waste everyone's time"). DIY HOW TO MAKE A COMPUTER PROGRAM CODEBesides using methods and subroutines in their code, Thomas and Hunt rely on code generators, automatic build systems, and scripting languages to observe the DRY principle across layers. Additionally, elements that are logically related all change predictably and uniformly, and are thus kept in sync. When the DRY principle is applied successfully, a modification of any single element of a system does not require a change in other logically unrelated elements. They apply it quite broadly to include " database schemas, test plans, the build system, even documentation". The principle has been formulated by Andy Hunt and Dave Thomas in their book The Pragmatic Programmer. The DRY principle is stated as "Every piece of knowledge must have a single, unambiguous, authoritative representation within a system". " Don't repeat yourself" ( DRY) is a principle of software development aimed at reducing repetition of software patterns, replacing it with abstractions or using data normalization to avoid redundancy. ( November 2021) ( Learn how and when to remove this template message) Unreliable citations may be challenged or deleted. Please help this article by looking for better, more reliable sources. Some of this article's listed sources may not be reliable. ![]()
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