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Merge pull request #35 from peter-gribanov/avoid_type_checking1

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Avoid type-checking (part 1)
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Tomáš Votruba
2017-08-31 19:51:07 +02:00
committed by GitHub
parent 399e3aa67b 825836b201
commit aa8a017520
1 changed files with 12 additions and 6 deletions
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README.md
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@@ -684,28 +684,34 @@ class Cessna extends Airplane {
**[⬆ back to top](#table-of-contents)**
### Avoid type-checking (part 1)
PHP is untyped, which means your functions can take any type of argument.
Sometimes you are bitten by this freedom and it becomes tempting to do
type-checking in your functions. There are many ways to avoid having to do this.
The first thing to consider is consistent APIs.
**Bad:**
```php
function travelToTexas($vehicle) {
function travelToTexas($vehicle)
{
if ($vehicle instanceof Bicycle) {
$vehicle->peddle($this->currentLocation, new Location('texas'));
} else if ($vehicle instanceof Car) {
$vehicle->drive($this->currentLocation, new Location('texas'));
$vehicle->peddleTo(new Location('texas'));
} elseif ($vehicle instanceof Car) {
$vehicle->driveTo(new Location('texas'));
}
}
```
**Good**:
```php
function travelToTexas($vehicle) {
$vehicle->move($this->currentLocation, new Location('texas'));
function travelToTexas(Traveler $vehicle)
{
$vehicle->travelTo(new Location('texas'));
}
```
**[⬆ back to top](#table-of-contents)**
### Avoid type-checking (part 2)