Ruby If Nil Then Empty String

False nil all blank true present.

Ruby if nil then empty string.

Because nil is nil not a string. To the object class. Method to avoid empty string as well. Nil object id 4 let s take.

As i said to s can return anything and in general doing things to that string will not affect the underlying object. It s just not worth it. Is also an activesupport extension to ruby object and it is the negation of blank. Because if discount is nil then it will not have a zero.

For example nil and are blank. Returns true for nil false empty or a whitespace string. An object is blank if it s false empty or a whitespace string. 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.

In the previous section we ve covered the nil construct in ruby. That way the returned value is always converted to a boolean value. Well nil is a special ruby object used to represent an empty or default value. Rails adds the method blank.

Dave newton jul 31 13 at 12 10. Is just a double negation of empty. Is a rails method and solves the issue of the ugly error you get when checking if something nil is empty. Returned nil or a string or a number something different than true or false.

This is an activerecord method that exists for any rails object and will return. It s also a falsy value meaning that it behaves like false when used in a conditional statement. Nil s to s returns a new string with nil inside it. Current ruby style guide stands the and and or keywords are banned.

I don t understand the issue. If you want b to be something other than nil you need to set it. Anything can potentially be nil and every object can answer to the nil method. Same is the case when data false blank.

This is useful in case empty. So it s better to use blank. Now let s cover a much more specific way of representing a lack of data and that is emptiness.