how exatcly does the number get added to the cache?

It means the value will only be replaced if it is nil or false. (Correct me if I'm wrong please, I'm also new)

#Case 1:
a = 1
a ||= 10
print a #=> 1

#Case 2:
a = nil
a ||= 10
print a #=> 10

a||= 10 is logically equivalent to: a || a = 10

Let's understand that behaviour. When we put together many or's:
a || b || c || d, it will return true immediatly when the first true value is found.
So in the example above, if 'a' is true, then b, c and d WON'T be evaluated by the or operator.

The same happens here: a || a = 10.

if a is false (or nil) it will evaluate (a = 10) which then changes the value of a.
if a is true (or != nil), then (a = 10) WON'T be evaluated at all.

Hello, I'm new to Ruby and was wondering what ||= does. Would anyone be able o explain the above code and how it works? Thanks!