Refactoring: Nested logical expressions

bad_code.php

<?php

public function canBuyALaptop()
{
    if( isCheap( $laptopRepository->price() )) {
        if( $laptopRepository->isAvailable() ) {
            return true;
        } else {
            return false;
        }
    } else {
        return false;
    }
}

better_code.php

<?php

public function canBuyALaptop()
{
    if( isCheap( $laptopRepository->price() ) && $laptopRepository->isAvailable() ) {
            return true;
    } 
        
    return false;
}

even_better_code.php

<?php

public function canBuyALaptop()
{
    return isCheap( $laptopRepository->price() ) && $laptopRepository->isAvailable();
}

good_code.php

<?php

public function canBuyALaptop()
{
    if( isCheap( $laptopRepository->price() )) {
        if( $laptopRepository->isAvailable() ) {
            return true;
        } 
        
        return false;
    }
    
    return false;
}