Ruby Check Nil Or Empty String

Well nil is a special ruby object used to represent an empty or default value.

Ruby check nil or empty string.

This is useful in case empty. Now let s cover a much more specific way of representing a lack of data and that is emptiness. Class string def present. For example and empty array is one that is not nil it is an array right and has no elements.

An empty string is one that is not nil it is a string right and has no bytes nothing. If the number was 0. An object is blank if it s false empty or a whitespace string. That way the returned value is always converted to a boolean value.

Method is analogous to the following. Anything can potentially be nil and every object can answer to the nil method. Everything can be nil but only collections can be empty. That means that an empty string is not nil and an empty array is not nil.

Is a string class method in ruby which is used to check whether the string length is zero or not. Return length 0 end so you can safely use. Neither is something that is false nil. Will only return true if the object itself is nil.

For example nil and are blank. The source of the empty. You can think of nil as the most general way of representing absence in ruby. True true false false nil false 0 true abc true.

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. From ruby 2 3 0 onward you can combine the safe navigation operator with numeric nonzero. Is a method some objects respond to.

Method inside the string class. Returns nil if the instance was nil and nonzero. You need to check the documentation for each case.