Ruby Check Nil Or Empty String

From ruby 2 3 0 onward you can combine the safe navigation operator with numeric nonzero.

Ruby check nil or empty string.

An empty string is one that is not nil it is a string right and has no bytes nothing. An object is blank if it s false empty or a whitespace string. Returns nil if the instance was nil and nonzero. Anything can potentially be nil and every object can answer to the nil method.

Is a string class method in ruby which is used to check whether the string length is zero or not. Well nil is a special ruby object used to represent an empty or default value. For example and empty array is one that is not nil it is an array right and has no elements. For example nil and are blank.

That means that an empty string is not nil and an empty array is not nil. It s also a falsy value meaning that it behaves like false when used in a conditional statement. True true false false nil false 0 true abc true. Will only return true if the object itself is nil.

Is a method some objects respond to. This is useful in case empty. Method inside the string class. Rails adds the method blank.

That way the returned value is always converted to a boolean value. If the number was 0. The source of the empty. Method is analogous to the following.

You can think of nil as the most general way of representing absence in ruby. You need to check the documentation for each case. Everything can be nil but only collections can be empty. Return length 0 end so you can safely use.

Any string length 0 anyway using that code inside an else if is a bit verbose i would encourage you to define the present. To the object class. Now let s cover a much more specific way of representing a lack of data and that is emptiness.