How to get the \Magento\Checkout\Model\Session singleton in a *.phtml template?

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1

@dmitry how to use this in my custom phtml file ?

2

Method 1

Using the object manager. It is shorter, and I prefer this way.
How to get a singleton with the object manager?

Method 2

Using constructor injection for the corresponding block class.
Magento 2 core prefers this way.
http://devdocs.magento.com/guides/v2.0/extension-dev-guide/depend-inj.html#dep-inj-preview-cons