MultiSelect.php

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<?php
namespace Magento\Ui\Component\Form\Element;

class MultiSelect extends AbstractOptionsField
{
    const NAME = 'multiselect';

    const DEFAULT_SIZE = 6;

    public function prepare()
    {
        $config['size'] = self::DEFAULT_SIZE;
        $this->setData('config', array_replace_recursive((array)$this->getData('config'), $config));
        parent::prepare();
    }

    public function getComponentName()
    {
        return static::NAME;
    }

    public function getIsSelected($optionValue)
    {
        return in_array($optionValue, (array) $this->getValue());
    }
}