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Clean code
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Adegoke Obasa Clean Code
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Transcript of Clean code
Adegoke Obasa
Clean Code
What is Clean Code
“Clean code is a code that is written by
someone who cares” - Micheal Feathers
It is written by someone who has treated it as
an art and paid attention to all details.
Focused- SRP (Single Responsibility Principle)
- Must do one thing only
Pleasant- Harry Potter :)
- Lord Of The Rings
- Asa’s Tunes
- KISS principle (Keep It Simple, Stupid!)
- YAGNI principle (You Ain’t Gonna Need It)
Easily Extended- You write code for other developers
- You could be that other developer
Smaller is Better- There should be a standard for max number of lines in a method.
- Example
- Methods - Avg. 30 code lines
- Class - < 30 Methods
- Packages - <= 30 Classes
Others- Unit Tests
- Loose Coupling
- High Cohesion
- Design Patterns
- Frameworks
Demo
public class Xbps {
public void go(String s) {
List l = prm.ld(s);
List l2 = copy(l);
for (int i = 0; i < l.size(); i++) {
String p = (String) l.get(i);
if (p.substring(5, 9).equals("9982")) {
l2.remove(p);
}
}
prm.sv(s, l2);
}...
public class ParametersValidator {
public void go(String s) {
List l = prm.ld(s);
List l2 = copy(l);
for (int i = 0; i < l.size(); i++) {
String p = (String) l.get(i);
if (!p.substring(5, 9).equals("9982")) {
l.remove(p);
}
}
prm.sv(s, l2);
}
...
public class ParametersValidator {
public void go(String s) {
List l = parameterStore.load(s);
List l2 = copy(l);
for (int i = 0; i < l.size(); i++) {
String p = (String) l.get(i);
if (!p.substring(5, 9).equals("9982")) {
l.remove(p);
}
}
parameterStore.save(s, l2);
}
...
public class ParametersValidator {
public void go(String webServiceName) {
List parameters =
parameterStore.load(webServiceName);
List validParams = copy(parameters);
for (int i = 0; i < parameters.size(); i++) {
String parameter = (String) parameters.get(i);
if (!parameter.substring(5, 9).equals("9982"))
{
validParams.remove(parameter);
}
}
parameterStore.save(webServiceName, validParams);
}
...
}
public class ParametersValidator {
public void removeInvalidParameters(String
webServiceName) {
List parameters =
parameterStore.load(webServiceName);
List validParams = copy(parameters);
for (int i = 0; i < parameters.size(); i++) {
String parameter = (String) parameters.get(i);
if (isInvalid(parameter)) {
validParams.remove(parameter);
}
}
parameterStore.save(webServiceName, validParams);
}
Lessons- Good Naming Conventions
- PascalCasing
- camelCasing
- snake_casing
- Good Code Formatting
- Coding Standards
- Good Comments
- Not too Much
Q & A
Further Reading
http://blog.goyello.com/2013/01/21/top-9-
principles-clean-code/
..on Software
<http://bodtoki.blogspot.com/2010/12/1-good-
names-good-code-series.html>
Thanks :)Adegoke Obasa
@goke_epapa
