Browsing by Subject "puhdas koodi"

Clean and high-quality code affects the maintainability of software throughout the software lifecycle. Cleanliness and high-quality should be pursued from the software development phase. Nowadays, the software is developed rapidly, which is why the code must be easy to maintain. When the code is easy to maintain, it can basically be managed by any software developer. The thesis conducted a literature review of clean and high-quality code. The thesis aimed to find out what is clean and high-quality code in the class and function level. The purpose of the thesis was to explain why clean and high-quality code is necessary and how the clean and high-quality code can be improved with different tools such as metrics, refactoring, code review, and unit tests. The thesis also included a survey for software developers. The survey sought an answer to how clean and high-quality code practices are implemented in working life from the perspective of software developers. 103 software professionals responded to the survey. Based on the responses, 82,5 \% of respondents felt that they always or usually write clean and high-quality code. The main reasons why clean and high-quality code cannot be written were the challenges of the old codebase and schedule pressures. Writing code is a very people-oriented job, so we must understand the code and its purpose. The code must be simple and carefully written. When the code is clean and high-quality, it is easier to read and understand, and thus easier to maintain.