Ruby Check Nil Or Empty String

True true false false nil false 0 true abc true.

Ruby check nil or empty string.

For example nil and are blank. Everything can be nil but only collections can be empty. Will only return true if the object itself is nil. Is a string class method in ruby which is used to check whether the string length is zero or not.

An empty string is one that is not nil it is a string right and has no bytes nothing. Method is analogous to the following. Method inside the string class. The source of the empty.

To the object class. You can think of nil as the most general way of representing absence in ruby. Is a method some objects respond to. That way the returned value is always converted to a boolean value.

For example and empty array is one that is not nil it is an array right and has no elements. It s also a falsy value meaning that it behaves like false when used in a conditional statement. Rails adds the method blank. Returns nil if the instance was nil and nonzero.

Well nil is a special ruby object used to represent an empty or default value. If the number was 0. Class string def present. Now let s cover a much more specific way of representing a lack of data and that is emptiness.

Neither is something that is false nil. You need to check the documentation for each case. 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.

An object is blank if it s false empty or a whitespace 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. Returned nil or a string or a number something different than true or false.