“const” variable not defined when used with “console.log”

I’m currently playing around with “const” variable in javascript and here is my code

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My question is, why is “const x” undefined when used with “console.log”, but it is defined when used on its own?

p.s. — I understand that both global “const, let” do not become the property of “window” object, unlike global “var”. But I am unsure as to whether this played any role in the code above.