Clean code ch02

Clean Code
‫نویسنده‬:Robert C. Martin
‫سال‬:2008

‫مطالب‬ ‫سرفصل‬
1.Meaningful Names
2.Functions
3.Comments
4.Formatting
5.Error Handling
6.Boundires
7.Unit Tests
8.Class

‫ی‬‫نامگذار‬ ‫قواعد‬:
1.‫معلوم‬ ‫های‬ ‫نام‬‫از‬‫استفاده‬
4.‫بیان‬‫قابل‬
3.‫گردد‬ ‫تمایز‬‫باعث‬ ‫گه‬ ‫ای‬ ‫کلمه‬ ‫از‬‫استفاده‬
5.‫باشد‬ ‫جستجو‬ ‫قابل‬‫سریع‬
8.‫مفهوم‬ ‫یک‬‫ای‬‫ر‬‫ب‬ ‫کلمه‬ ‫یک‬
6.‫پیشوند‬
7.‫ذهنی‬ ‫کلمات‬
2.‫غلط‬ ‫اطالعات‬ ‫از‬‫اجتناب‬
Soultion Domain Names 9.

‫ل‬‫او‬ ‫قاعده‬:
1Small
1.‫باید‬ ‫تابع‬ ‫هر‬2‫الی‬3‫الی‬4‫باشد‬ ‫خط‬.
2.‫باشد‬ ‫شفاف‬.
3.‫کند‬ ‫بیان‬‫ا‬‫ر‬ ‫داستان‬ ‫یک‬ ‫تابع‬‫هر‬.

‫ل‬‫او‬ ‫قاعده‬:
1Small

‫دوم‬ ‫قاعده‬:
2Do One Thing
Function do one thing,
they should dot it well.
They should do it Only.

‫دوم‬ ‫قاعده‬:
2Do One Thing

‫سوم‬ ‫قاعده‬:
3One Level of abstraction per function
One Level of Abstraction per function
getHtml();
//Hight level of abstraction
//Intermediate level of abstraction
String pagePathName = PathParse.Render(pagePath);

‫م‬‫ر‬‫چها‬‫قاعده‬:
4Switch Statement

4Switch Statement
public class Bird
{
public double GetSpeed()
{
switch (type)
{
case EUROPEAN:
return GetBaseSpeed();
case AFRICAN:
return GetBaseSpeed() - GetLoadFactor() * numberOfCoconuts;
case NORWEGIAN_BLUE:
return isNailed ? 0 : GetBaseSpeed(voltage);
default:
throw new Exception("Should be unreachable");
}
}
}

4Switch Statement
public abstract class Bird
{
public abstract double GetSpeed();
}
class European: Bird
{
public override double GetSpeed()
{
return GetBaseSpeed();
}
}
class African: Bird
{
{
return GetBaseSpeed() - GetLoadFactor() *
numberOfCoconuts;
}
}
class NorwegianBlue: Bird
{
{
return isNailed ? 0 : GetBaseSpeed(voltage);
}
}

‫پنجم‬ ‫قاعده‬:
5Use Descriptive Name

‫ششم‬ ‫قاعده‬:
6Function Argument
More than three or four parameters for a method.

6Function Argument ‫ششم‬ ‫قاعده‬:

‫هفتم‬ ‫قاعده‬:
7Argument Objects
Compare:
Circle makeCircle(double x, double y, double radius);
vs
Circle makeCircle(Point center, double radius);

‫هشتم‬ ‫قاعده‬:
8Have No Side Effects

‫نهم‬ ‫قاعده‬:
9Don’t repeat yourself

‫دهم‬ ‫قاعده‬:
10Prefer Exceptions to Returning Error Codes
Command Query Separation
Functions should either do something or answer something, but not
both. Either your function should change the state of an object, or
it should return some information about that object. Doing both
often leads to confusion.
Returning error codes from command functions is a subtle violation of
command query separation.

‫توابع‬ ‫قاعده‬:
1.Small
2.Do One Thing
3.One Level Of Abstractions
4.Switch Case Statement
5.Use Descriptive Names
6.Function Arguments
8.Have No Side Effect
9.Don’t Repeat Yourself
10. Prefer Exceptions to Returning Error Codes
7. Argument Objects

Clean code ch02

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