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Oops concept code test

Provide a good approach for the practical Oops concept. 

There should be an employer add facility. Employer can have two types t1 and t2. There should be an option to calculate the tax.

t1 and t2 will have different logics. What approach is good for php Oops?

-----------------

Here's an object-oriented approach using Strategy Pattern for tax calculation:


// Abstract base class for employers

abstract class Employer {

    protected $name;

    protected $type;

    protected $taxCalculator;


    public function __construct($name, TaxCalculatorStrategy $taxCalculator) {

        $this->name = $name;

        $this->taxCalculator = $taxCalculator;

    }


    // Strategy for tax calculation

    public function calculateTax($income) {

        return $this->taxCalculator->calculate($income);

    }

}


// Tax calculation strategy interface

interface TaxCalculatorStrategy {

    public function calculate($income);

}


// Type 1 Employer Tax Calculation

class TypeOneEmployerTax implements TaxCalculatorStrategy {

    public function calculate($income) {

        // Specific tax logic for Type 1

        return $income * 0.1; // 10% tax rate

    }

}


// Type 2 Employer Tax Calculation

class TypeTwoEmployerTax implements TaxCalculatorStrategy {

    public function calculate($income) {

        // Specific tax logic for Type 2

        return $income * 0.15; // 15% tax rate

    }

}


// Concrete Employer Classes

class TypeOneEmployer extends Employer {

    public function __construct($name) {

        parent::__construct($name, new TypeOneEmployerTax());

    }

}


class TypeTwoEmployer extends Employer {

    public function __construct($name) {

        parent::__construct($name, new TypeTwoEmployerTax());

    }

}


// Usage

$employer1 = new TypeOneEmployer("Tech Corp");

$employer2 = new TypeTwoEmployer("Finance Inc");


echo $employer1->calculateTax(50000); // Calculates with Type 1 tax logic

echo $employer2->calculateTax(50000); // Calculates with Type 2 tax logic


Key benefits of this approach:


Flexible tax calculation strategies

Easy to add new employer types

Follows Open/Closed Principle

Decouples tax calculation logic from employer class


Comments

  1. AnonymousDecember 9, 2024 at 3:32 AM

    name = $name;
    $this->id = $id;
    $this->salary = $salary;
    }

    // Abstract method for tax calculation
    abstract public function calculateTax();

    // Getter methods
    public function getName() {
    return $this->name;
    }

    public function getId() {
    return $this->id;
    }

    public function getSalary() {
    return $this->salary;
    }
    }

    // Concrete implementation for Type 1 Employer
    class EmployerTypeOne extends Employer {

    public function __construct($name, $id, $salary) {
    parent::__construct($name, $id, $salary);
    }

    public function calculateTax() {
    // Type 1 specific tax calculation
    $taxableIncome = $this->salary ;

    if ($taxableIncome <= 250000) {
    return 0; // No tax for income below 250,000
    } elseif ($taxableIncome <= 500000) {
    return $taxableIncome * 0.05; // 5% tax
    } elseif ($taxableIncome <= 1000000) {
    return $taxableIncome * 0.20; // 20% tax
    } else {
    return $taxableIncome * 0.30; // 30% tax for higher incomes
    }
    }
    }

    // Concrete implementation for Type 2 Employer
    class EmployerTypeTwo extends Employer {

    public function __construct($name, $id, $salary ) {
    parent::__construct($name, $id, $salary);
    }

    public function calculateTax() {
    // Type 2 specific tax calculation
    $taxableIncome = $this->salary ;

    if ($taxableIncome <= 300000) {
    return 0; // No tax for income below 300,000
    } elseif ($taxableIncome <= 600000) {
    return $taxableIncome * 0.10; // 10% tax
    } elseif ($taxableIncome <= 1200000) {
    return $taxableIncome * 0.15; // 15% tax
    } else {
    return $taxableIncome * 0.35; // 35% tax for higher incomes
    }
    }
    }

    $employer = new EmployerTypeOne(
    "Sreekala",
    "T1-001",
    500000
    );


    print_r($employer->calculateTax() );

    ReplyDelete

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