3.1 KiB
title, created_date, updated_date, aliases, tags, type, course_name, author, source, status
| title | created_date | updated_date | aliases | tags | type | course_name | author | source | status | |
|---|---|---|---|---|---|---|---|---|---|---|
| Design Patterns by Construx | 2025-01-16 | 2025-01-16 |
|
course | Design Patterns | Construx | https://construx.vueocity.com/portal/design-patterns | not_started |
Design Patterns by Construx
- 🏷️Tags : #01-2025 #book
Summary
[!summary] Summary 3 Sentences only!
- What are the main ideas?
- If I implemented one idea from this book right now, which one would it be?
- How would I describe the course to someone else?
Ideas and Thoughts
[!info]+ Inspiring Questions
- Did you think about other concepts from other resources?
- Do the concepts fit to your past, to your memories?
- Can you relive them and reflect them from a different angle?
Chapters
Getting Started
[!definition] UML Notation Contents
[!Definition] What is a Design Pattern A standard solution to a recurring problem.
We should not reinvent the wheel. Patterns are much more reusable than code.
A bridge is a design pattern because it is a standard solution to a recurring problem: we need to get things across a not passable obstacle. For every problem you have design criteria to choose the best type of bridge (e.g. span, clearance, loads, cost, etc.). In design patterns design criteria are called Goal forces and constraint forces. As a beginner: focus on the problem, not the solutions!
UML Notations:
Note
!
Class, Attribute and Operation
!
Operations are viewed from extern Methods are viewed from intern
Minimize Overall Complexity
Measures of complexity
- Cyclomatic complexity: the number of decisions that are being made --> local complexity
- Depth of decision making: embedding of decision within decision and decision --> local complexity
- number of parameters: --> global complexity
- fan out: number of functions that are called by the function --> global complexity
!
Local complexity is a measure on how complicated each function is, whereas the global complexity is the complexity in between functions. Remember to get an appropriate balance.
Use Abstractions
Syntax: Is all about structure Semantics: Is all about meaning
- Colorless green dreams sleep furiously: correct syntax, completely wrong semantics --> defective or buggy code, because it is semantically meaningless
The compiler is a master of syntax but cannot know anything about semantics. The programmer needs to focus much more on semantics, because the complier will take care of the syntax.
[!NOTE] Abstraction the principle of ignoring those aspects of a subject that are not relevant to the current purpose in order to concentrate solely on those that are.
It is a tool to reduce and manage complexity.
what is the role of one function / subroutine? The more abstraction you have, the less performant the code becomes. Abstraction i
Exercises
Design Patterns Construx
-file: "Design Patterns by Construx.md"