Ruby Check Nil Or Empty String

That means that an empty string is not nil and an empty array is not nil. Returned nil or a string or a number something different than true or false. Rails adds the method blank.

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Neither is something that is false nil.

Ruby check nil or empty string.

It s also a falsy value meaning that it behaves like false when used in a conditional statement. To the object class. True true false false nil false 0 true abc true. Method is analogous to the following.

Anything can potentially be nil and every object can answer to the nil method. From ruby 2 3 0 onward you can combine the safe navigation operator with numeric nonzero. Everything can be nil but only collections can be empty. That way the returned value is always converted to a boolean value.

An empty string is one that is not nil it is a string right and has no bytes nothing. Well nil is a special ruby object used to represent an empty or default value. Is a string class method in ruby which is used to check whether the string length is zero or not. The source of the empty.

For example and empty array is one that is not nil it is an array right and has no elements. Returns nil if the instance was nil and nonzero. An object is blank if it s false empty or a whitespace string. You need to check the documentation for each case.

Return length 0 end so you can safely use. If the number was 0. Class string def present. You can think of nil as the most general way of representing absence in ruby.

Will only return true if the object itself is nil. For example nil and are blank. Now let s cover a much more specific way of representing a lack of data and that is emptiness. Is a method some objects respond to.

Method inside the string class. Any string length 0 anyway using that code inside an else if is a bit verbose i would encourage you to define the present. This is useful in case empty.