Var vs function.

Question

What is the difference between var x = true (result is boolean) and var x = function() { return true }. (Returns boolean..?)
Both variable and function I can invoke on any time. My mind now is overheat.
Var x and var x() or function x() - Where this ones are used?

Answer 1

Differences between Declarations and Expressions. Similar to the var statement, function declarations are hoisted to the top of other code. Function expressions aren't hoisted, which allows them to retain a copy of the local variables from the scope where they were defined.

https://www.sitepoint.com/function-expressions-vs-declarations/