فصل 1. بدهی فنی / Technical debt

فصل 2. بوی بد کد / Code Smell

فصل 3. Extract Method

public function delete(int id)
{
    order = this.find(id)
    order.delete()
}

public function delete(Order order)
{
    order.delete()
}

public function findByID(int id)
{
    order = this.find(id)
    return order
}

فصل 4. Introduce Foreign Method

class Report
{
	public function sendReport()
	{
		nextDay = new Date(previousEnd.getYear(), previousEnd.getMonth(), previousEnd.getDate() + 1)
		// ...
	}
}

class Report
{
	public function sendReport()
	{
		Date newStart = this._nextDay(previousEnd)
		// ...
	}

	private function _nextDay(Date arg)
	{
		return new Date(arg.getYear(), arg.getMonth(), arg.getDate() + 1)
	}
}

فصل 5. Replace Array with Object

String[] row = new String[3]
row[0] = "refactoring"
row[1] = "[email protected]"
row[2] = "157298"

Performance row = new Performance()
row.setName("refactoring")
row.setEmail("[email protected]")
row.setID(157298)

فصل 6. Replace Nested Conditional with Guard Clauses

if (number >= 0)
{
	if (number == 0)
	{
		return "the number is zero"
	}
	else
	{
        		return "positive number"
	}
}
else
{
        return "negative number"
}

if (number < 0)
{
    return "negative number"
}

if (number == 0)
{
    return "the number is zero"
}

return "positive number"

فصل 7. Parameterize Method

date = new Date
date.addOneWeek()
date.addTwoWeek()
date.addThreeWeek()
date.addFourWeek()

date = new Date
date.addWeeks(1)
date.addWeeks(2)
date.addWeeks(3)
date.addWeeks(4)

فصل 8. Pull Up Constructor Body

class Employee
{
	public function Employee(data)
	{
		parentConstructor(data) // call parent construct
	}
}