JS - assigning function to variable [duplicate]

Answer 1

Didn't we just assigning x to a() function?.

No, you assigned the returned value from a() to x.

If you don't want to call a, then do

var x = a;

and later do

x();

Answer 2

You're wrong. You are invoking the function:

var x = a(); // assigning function to new variable

This line of code says invoke a when you write a(). The parentheses indicate an invocation.

To assign a function to a variable you have to use just the name, such as:

var x = a;

or pass the name to a function f:

f(a)

As a counter-example you invoke it in this next line of code and pass to g not the function be the result of its execution:

g(a())