Ruby Check Nil Or Empty String

For example nil and are blank.

Ruby check nil or empty string.

That means that an empty string is not nil and an empty array is not nil. From ruby 2 3 0 onward you can combine the safe navigation operator with numeric nonzero. Will only return true if the object itself is nil. Now let s cover a much more specific way of representing a lack of data and that is emptiness.

True true false false nil false 0 true abc true. Returns nil if the instance was nil and nonzero. This is useful in case empty. That way the returned value is always converted to a boolean value.

You can think of nil as the most general way of representing absence in ruby. An empty string is one that is not nil it is a string right and has no bytes nothing. Is a string class method in ruby which is used to check whether the string length is zero or not. Class string def present.

To the object class. Everything can be nil but only collections can be empty. Neither is something that is false nil. For example and empty array is one that is not nil it is an array right and has no elements.

Method is analogous to the following. If the number was 0. Method inside the string class. Well nil is a special ruby object used to represent an empty or default value.

Return length 0 end so you can safely use. It s also a falsy value meaning that it behaves like false when used in a conditional statement. Any string length 0 anyway using that code inside an else if is a bit verbose i would encourage you to define the present. You need to check the documentation for each case.

Is a method some objects respond to. The source of the empty. Returned nil or a string or a number something different than true or false.