ruby check for null string

string = "" unless dwn.220.v.ua? # end Maybe it is better to use ...

string = "" unless dwn.220.v.ua? # end Maybe it is better to use squish as ' 'dwn.220.v.ua? Alas squish is in rails and not in ruby.

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When I'm not worried about performance, I'll often use this: if d...

When I'm not worried about performance, I'll often use this: if dwn.220.v.ua? # It's nil or empty end.

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Coming from C# I liked the Frameworks implemented option to check in one go...

Coming from C# I liked the Frameworks implemented option to check in one go if a given string is null or empty. Now in Ruby the string class.

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You need to check the documentation for each case. An empty string is one t...

You need to check the documentation for each case. An empty string is one that is not nil (it is a string right?) and has no bytes, nothing.

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So you might be doing some ruby on rails coding and you see stuff like dwn....

So you might be doing some ruby on rails coding and you see stuff like dwn.220.v.ua? call at the same time, and for strings check also check for.

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And even those speaking Ruby quite fluently don't usually know the tin...

And even those speaking Ruby quite fluently don't usually know the tiny little So, to check whether object is nil (NULL), one should compare it.

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String#blank? behavior was changed compared to what ruby does with Perhaps ...

String#blank? behavior was changed compared to what ruby does with Perhaps for speed of not checking if they have empty? method which.

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Returns converted string or nil if obj cannot be converted for any reason. ...

Returns converted string or nil if obj cannot be converted for any reason. . Additionally, an empty string is returned when the starting index for a character range.

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@etienneroudeix, this is standard Ruby (doesn't depend on Rails), but ...

@etienneroudeix, this is standard Ruby (doesn't depend on Rails), but it But I still only can test empty string like that: my_variable is {% if.

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“”.nil = dwn.220.v.ua? - It is Ruby method - can be used on strings, arrays...

“”.nil = dwn.220.v.ua? - It is Ruby method - can be used on strings, arrays and hashes and returns true if: String length == 0; Array length == 0.

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If object is either nil or a string, you can just do value = object || &quo...

If object is either nil or a string, you can just do value = object || "". you don't actually need to check for nil at all since ruby handles this for you.

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Secondly the "or" operator in Ruby || always returns one of the v...

Secondly the "or" operator in Ruby || always returns one of the values you are comparing. Since nil is already falsy you could omit this explicit check. A string attribute in ActiveRecord only returns either nil or the string.

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nil? When the value is nil for each object. empty? To check for the empty s...

nil? When the value is nil for each object. empty? To check for the empty string, array, hash. blank? To check the object has a value of nil.

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Check for nil and initialize on a single line you want to initialize a vari...

Check for nil and initialize on a single line you want to initialize a variable to some value only if that variable is equal to nil. Appending to a string →.

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Ruby offers various enumerables on collections that check for validity of t...

Ruby offers various enumerables on collections that check for validity of the objects String} # checks if any value of the Hash object is of the type String => False dwn.220.v.ua {|a| a > 5} # returns the first element greater than 5 and `nil` if none.

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