Ruby Check Nil Or Empty String

Return length 0 end so you can safely use.

Ruby check nil or empty string.

Any string length 0 anyway using that code inside an else if is a bit verbose i would encourage you to define the present. Method inside the string class. From ruby 2 3 0 onward you can combine the safe navigation operator with numeric nonzero. Well nil is a special ruby object used to represent an empty or default value.

Rails adds the method blank. Is a method some objects respond to. Returned nil or a string or a number something different than true or false. Is a string class method in ruby which is used to check whether the string length is zero or not.

This is useful in case empty. For example and empty array is one that is not nil it is an array right and has no elements. 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.

That way the returned value is always converted to a boolean value. It s also a falsy value meaning that it behaves like false when used in a conditional statement. Now let s cover a much more specific way of representing a lack of data and that is emptiness. Everything can be nil but only collections can be empty.

To the object class. True true false false nil false 0 true abc true. The source of the empty. You need to check the documentation for each case.

An object is blank if it s false empty or a whitespace string. Method is analogous to the following. Returns nil if the instance was nil and nonzero. If the number was 0.

That means that an empty string is not nil and an empty array is not nil. For example nil and are blank. Anything can potentially be nil and every object can answer to the nil method.