SOLVED Createblock definition in magento 2

Question

i search around a lot about references of this function. but the documentation have a big lack. does somebody explain me this part of code (deeply) ?

 $this->getLayout()->createBlock(
 ClassElementLikeSelect::class,
 '',
 ['data' => ['is_render_to_js_template' => true]]
 );

i don't understand this solution. i find this everywhere but nobody explain why you set that argument (is_render_to_js_template for example) .

UPDATE:

the createBlock is definite with block Factory and are inside these classes

https://github.com/magento/magento2/blob/0eb8677b0b4e35606032e856cc1ef7c80e68829f/lib/internal/Magento/Framework/View/Layout.php

https://github.com/magento/magento2/blob/0eb8677b0b4e35606032e856cc1ef7c80e68829f/lib/internal/Magento/Framework/View/Layout/Generator/Block.php

Answer 1

This is only used in a couple of places

https://github.com/magento/magento2/search?q=is_render_to_js_template&unscoped_q=is_render_to_js_template

 /**
 * Block Factory
 *
 * @param string $type
 * @param string $name
 * @param array $arguments
 * @return \Magento\Framework\View\Element\AbstractBlock
 */
 public function createBlock($type, $name = '', array $arguments = [])

So it's arguments that you are passing to block.

As to why. I'm baffled. Other than online tutorials and the two references above I can't find anything.

You can echo out blocks. Sometimes useful for debugging. See if it makes a difference to output?

echo $this->getLayout()
 ->createBlock('Vendor\Extension\Block\Hello')
  ->toHtml();

• Pavel: thank you man probably i have found the answer i put under the question. but you help me a lot really thanks