When we add an expression
as a value to a variable,
it first gets evaluated
and
then the result is stored
in the variable.
Consider the following example:
In the example given above,
we are storing the result of
an expression 23 + 45 as
a value to the variable sum.
In the next line, we are logging
the value of sum to the console.
We see that the console displays
68
and
not the expression 23 + 45 itself.
This is because the expression is first
evaluated, then the result of this
evaluation, 68, is stored as a value
for the variable sum.