Ruby Check Nil Or Empty String

Is a method some objects respond to.

Ruby check nil or empty string.

Returns nil if the instance was nil and nonzero. This is useful in case empty. Will only return true if the object itself is nil. For example nil and are blank.

An object is blank if it s false empty or a whitespace string. You can think of nil as the most general way of representing absence in ruby. The source of the empty. Neither is something that is false nil.

It s also a falsy value meaning that it behaves like false when used in a conditional statement. Rails adds the method blank. From ruby 2 3 0 onward you can combine the safe navigation operator with numeric nonzero. Now let s cover a much more specific way of representing a lack of data and that is emptiness.

If the number was 0. Anything can potentially be nil and every object can answer to the nil method. 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.

An empty string is one that is not nil it is a string right and has no bytes nothing. Everything can be nil but only collections can be empty. Method inside the string class. Class string def present.

True true false false nil false 0 true abc true. Is a string class method in ruby which is used to check whether the string length is zero or not. That means that an empty string is not nil and an empty array is not nil. Method is analogous to the following.

For example and empty array is one that is not nil it is an array right and has no elements. Return length 0 end so you can safely use. That way the returned value is always converted to a boolean value.