Ruby If Nil Then Empty String

Is an activesupport extension to ruby object and returns true for nil false empty or a white space string. In the previous section we ve covered the nil construct in ruby. As i said to s can return anything and in general doing things to that string will not affect the underlying object.

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Method to avoid empty string as well.

Ruby if nil then empty string.

Is a rails method and solves the issue of the ugly error you get when checking if something nil is empty. You can think of nil as the most general way of representing absence in ruby. It s just not worth it. This is an activerecord method that exists for any rails object and will return.

To the object class. 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. This is useful in case empty. False nil all blank true present.

Nil s to s returns a new string with nil inside it. I don t understand the issue. Nil object id 4 let s take. Anything can potentially be nil and every object can answer to the nil method.

If you want b to be something other than nil you need to set it. For example nil and are blank. So it s better to use blank.

Current ruby style guide stands the and and or keywords are banned. That way the returned value is always converted to a boolean value. An object is blank if it s false empty or a whitespace string. Because if discount is nil then it will not have a zero.

Because nil is nil not a string. Well nil is a special ruby object used to represent an empty or default value. Returns true for nil false empty or a whitespace string. Dave newton jul 31 13 at 12 10.

Now let s cover a much more specific way of representing a lack of data and that is emptiness. Is also an activesupport extension to ruby object and it is the negation of blank. Same is the case when data false blank. Rails adds the method blank.

Returned nil or a string or a number something different than true or false. It s also a falsy value meaning that it behaves like false when used in a conditional statement. Is just a double negation of empty.