Ruby If Nil Then Empty String

So it s better to use blank.

Ruby if nil then empty string.

An object is blank if it s false empty or a whitespace string. If you want b to be something other than nil you need to set it. Well nil is a special ruby object used to represent an empty or default value. To the object class.

I don t understand the issue. Rails adds the method blank. Returns true for nil false empty or a whitespace string. Because if discount is nil then it will not have a zero.

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. For example nil and are blank. Anything can potentially be nil and every object can answer to the nil method.

This is useful in case empty. That way the returned value is always converted to a boolean value. You can think of nil as the most general way of representing absence in ruby.

It s just not worth it. Now let s cover a much more specific way of representing a lack of data and that is emptiness. False nil all blank true present. Same is the case when data false blank.

Method to avoid empty string as well. 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. As i said to s can return anything and in general doing things to that string will not affect the underlying object.

Dave newton jul 31 13 at 12 10. In the previous section we ve covered the nil construct in ruby. Because nil is nil not a string. Nil s to s returns a new string with nil inside it.

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. Current ruby style guide stands the and and or keywords are banned. Nil object id 4 let s take.