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I am not experienced in Ruby, so my code feels "ugly" and not idiomatic:
def logged_in? !user.nil? end I'd rather have something like
def logged_in? user.not_nil? end But cannot find such a method that opposites nil?
991
In Ruby, nil is a special value that denotes the absence of any value. Nil is an object of NilClass. nil is Ruby's way of referring to nothing or void.
nil is an Object, NULL is a memory pointer Sadly, when this happens, Ruby developers are confusing a simple little Ruby object for something that's usually radically different in “blub” language. Often, this other thing is a memory pointer, sometimes called NULL, which traditionally has the value 0.
That's the easy part. In Ruby, you can check if an object is nil, just by calling the nil? on the object... even if the object is nil. That's quite logical if you think about it :) Side note : in Ruby, by convention, every method that ends with a question mark is designed to return a boolean (true or false).
Well, nil is a special Ruby object used to represent an “empty” or “default” value. It's also a “falsy” value, meaning that it behaves like false when used in a conditional statement.
You seem overly concerned with booleans.
def logged_in? user end If the user is nil, then logged_in? will return a "falsey" value. Otherwise, it will return an object. In Ruby we don't need to return true or false, since we have "truthy" and "falsey" values like in JavaScript.
Update
If you're using Rails, you can make this read more nicely by using the present? method:
def logged_in? user.present? end If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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