Ruby If Nil Then Empty String

An object is blank if it s false empty or a whitespace string.

Ruby if nil then empty string. As i said to s can return anything and in general doing things to that string will not affect the underlying object. Is an activesupport extension to ruby object and returns true for nil false empty or a white space string. It s also a falsy value meaning that it behaves like false when used in a conditional statement. For example nil and are blank.

To the object class. Method to avoid empty string as well. Same is the case when data false blank.

Current ruby style guide stands the and and or keywords are banned. You can think of nil as the most general way of representing absence in ruby. Returns true for nil false empty or a whitespace string. If you want b to be something other than nil you need to set it.

Dave newton jul 31 13 at 12 10. Is a rails method and solves the issue of the ugly error you get when checking if something nil is empty. This is an activerecord method that exists for any rails object and will return. I don t understand the issue.

Anything can potentially be nil and every object can answer to the nil method. In the previous section we ve covered the nil construct in ruby. So it s better to use blank. Rails adds the method blank.

Now let s cover a much more specific way of representing a lack of data and that is emptiness. It s just not worth it. Because nil is nil not a string. Well nil is a special ruby object used to represent an empty or default value.

Because if discount is nil then it will not have a zero. Nil s to s returns a new string with nil inside it. This is useful in case empty. There is only one nil object with an object id of 4 or 8 in 64 bit ruby this is part of why nil is special.

That way the returned value is always converted to a boolean value. Is also an activesupport extension to ruby object and it is the negation of blank. Nil object id 4 let s take.