Ruby Check Nil Or Empty String

Is a string class method in ruby which is used to check whether the string length is zero or not.

Ruby check nil or empty string.

Will only return true if the object itself is nil. You can think of nil as the most general way of representing absence in ruby. Method inside the string class. Anything can potentially be nil and every object can answer to the nil method.

Returned nil or a string or a number something different than true or false. It s also a falsy value meaning that it behaves like false when used in a conditional statement. If the number was 0. An object is blank if it s false empty or a whitespace string.

The source of the empty. Now let s cover a much more specific way of representing a lack of data and that is emptiness. An empty string is one that is not nil it is a string right and has no bytes nothing. Neither is something that is false nil.

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. Rails adds the method blank. You need to check the documentation for each case.

Any string length 0 anyway using that code inside an else if is a bit verbose i would encourage you to define the present. Return length 0 end so you can safely use. Method is analogous to the following. Is a method some objects respond to.

For example nil and are blank. True true false false nil false 0 true abc true. Well nil is a special ruby object used to represent an empty or default value. That means that an empty string is not nil and an empty array is not nil.

Everything can be nil but only collections can be empty. Returns nil if the instance was nil and nonzero. From ruby 2 3 0 onward you can combine the safe navigation operator with numeric nonzero.