How to get children skus list from configurable product?

Question

I know to load children skus with loading parent object but I am finding the way where I can load all children items by just passing configurable product id, is there any method please share here thank you it works fine with below method but it requires to load parent object

$configurableProduct=$this->productRepository->getById($parentId);
//\Magento\ConfigurableProduct\Model\Product\Type\Configurable
$options = $this->configurable->getConfigurableOptions($configurableProduct);  

Answer 1

Please try following code

$objectManager = \Magento\Framework\App\ObjectManager::getInstance();
$configProduct = $objectManager->create('Magento\Catalog\Model\Product')->load($parentId);

$_children = $configProduct->getTypeInstance()->getUsedProducts($configProduct);
$getChildSku = array();
foreach ($_children as $child){    
    $product = $objectManager->create('Magento\Catalog\Model\Product')->load($child->getID());
    $getChildSku[] = $product->getSku();
}
echo "<pre>";
print_r($getChildSku);
echo "</pre>"; 

Manage objectManager yourself

Answer 2

I hope this works for you

public function __construct(     
    \Magento\Catalog\Model\ProductFactory $_productloader
) {
    $this->_productloader = $_productloader;
}

public function getLoadProduct()
{
    // $product_id=7; // configurable product id
    // $configProduct=$this->_productloader->create()->load($product_id);
    $configProduct = 'your config product object'; // your config product object
    $_children = $configProduct->getTypeInstance()->getUsedProducts($configProduct);

    foreach ($_children as $child) {
        echo "Child Product Skus ".$child->getSku()".<br />;
    }
}