The return keyword returns nil if no value is passed as argument. In Ruby, in contrast, only nil (Ruby's null value) and a special false object are false, all else (including the integer 0 and empty arrays) is true. that checks for nil before calling a method. This is extremely convenient, but it is also something we need to learn: If we don’t do anything else, then a method will return the value that wasreturned from the last evaluated statement. @the-tin-man do you agree with this take? plus one, someone else has hundreds of upvotes! Thus reduce the number of passes by using reduce! Asking for help, clarification, or responding to other answers. If you are having to select afterwards (or compact) then you probably don't want a map on the set. obj is always evaluated as it is the argument to a method call—there is no short-circuit evaluation in this case. We would get the rather unexpected result of z being nil instead of 3. 1. Was memory corruption a common problem in large programs written in assembly language? Yes, that's the nice thing about languages that have core teams who listen. These don’t check whether elements exist, but whether they make the block return a truthy value (or if you don’t pass a block, then whether they are truthy). Ruby program that uses implicit return value. Well, to map and remove nil values is to reduce. What they print to the console is NOT their return value. Yes, set subtraction will work, but it's about half as fast due to its overhead. It's not like shell where the return value of previous statements carries over. if test() == nil puts true end true. Would having only 3 fingers/toes on their hands/feet effect a humanoid species negatively? If I assume that you are going to process the value of x by passing it some url and determine which of the xs really get processed into valid non-nil results - then, may be Enumerabble.group_by is a better option than Enumerable#map. That's true! Mobile friendly way for explanation why button is disabled. Alternative solution is to use Refinements, like so: I believe the following is good enough for ruby code. Answer from @Ziggy should be accepted as a correct answer. Is There a Better Way of Checking Nil or Length == 0 of a String in Ruby? with Numeric#nonzero?. I believe that one day, with your help, this answer will surpass the accepted on. Ruby has a variety of ways to control execution that is pretty common to other modern languages. Provided by Ruby 2. Extract first word from a line in a file using Ruby. Tags: Ruby My eBook: “Memoirs of a Software Team Leader” Read more. Thanks for contributing an answer to Stack Overflow! discount may be nil, discount may be int 0, discount may be float 0.0, discount may be string "0.0", "0". Why is it bad style to `rescue Exception => e` in Ruby? ! Ruby's short-circuit evaluation should prevent it from trying to evaluate discount.zero?, however, if discount is nil. Stack Overflow for Teams is a private, secure spot for you and Can be used on collections such as Array, Hash, Set etc. Here, we use Enumerable#each_with_object to collect values, and make use of Object#tap to get rid of temporary variable that is otherwise needed for nil check on result of process_x method. Thanks @PeterHamilton - appreciate the feedback, and hope it will prove useful to plenty of people. github.com/cognitect-labs/transducers-ruby, Episode 306: Gaming PCs to heat your home, oceans to cool your data centers. Asking for help, clarification, or responding to other answers. If we pass "" it will return false whereas blank? In either case you are iterating twice over the entire set, when a reduce only needs to go once. !true # true !false # true Ruby Splat Operator (With Examples) The splat operator (*) is interesting because it does something you can’t do without it. Deletes the key-value pair and returns the value from hsh whose key is equal to key. How to kill an alien with a decentralized organ system? How do I remove blank elements from an array? If the key is not found, returns a default value. As we can see, the local variable was assigned the value nil, the same nil that we saw as “=> nil”. From Ruby 2.3.0 onward, you can combine the safe navigation operator (&.) Here, we have explained if Expression, Ternary if, unless Expression, Modifier if and unless and case Expression . It doesn't sound like you read the OPs question or the answer. In the last form, an array of the given size is created. [key] Using a key, references a value from hash. Each element in this array is created by passing the element's index to the given block and storing the return value. Example 1: This check handles good amount of cases i.e. Anytime I see nils in an array I'm working on, I dig into why they exist, and see if I can improve the code generating the array, rather than allow Ruby to waste time and memory generating nils then sifting through the array to remove them later. I don't think I could write a unit test that shows any difference between this and the original. Implicit return. rev 2021.1.21.38376, Stack Overflow works best with JavaScript enabled, Where developers & technologists share private knowledge with coworkers, Programming & related technical career opportunities, Recruit tech talent & build your employer brand, Reach developers & technologists worldwide. I disagree! Methods return nil if no other return value is specified. Is there a nice way to map a function over a list, removing/excluding the nils as you go? Where was this picture of a seaside road taken? You can take advantage of the NilClass provided #to_i method, which will return zero for nil values: If discount can be fractional numbers, you can use #to_f instead, to prevent the number from being rounded to zero. Not every object which iterates and returns values knows if if it has any value to return 1. after that, all we need to do is check whether the final value is a zero. Well, nil is a special Ruby object used to represent an “empty” or “default” value. The problem with empty? Likewise, if the value isn't literally "false" but evaluates as false, we call it "falsey." So had we done this with our add method above: def add (x, y) puts x + y end z = add (2, 1) 3 => nil z == 3 => false z == nil => true. @yxi But according to those guidelines, isn't || the preferred option in this case? Instead it is concerned with the case when you have something you know should be a number, but might also be. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. # A simple example function, which returns a value or nil def transform(n) rand > 0.5 ? If the value isn't literally "true" but evaluates as true, we call it "truthy." I would make that fact clear in the answer, rather than someone skim-reading this and not spotting the disclaimer in the comments. Example:!true # false ! How to accomplish? By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. It's important to note that try is defined in the ActiveSupport gem, so it is not available in plain ruby. IMO, assuming you have good reason to use return with a nil value, the implied nil is best. method which Ruby 2.3.0 added a safe navigation operator (&.) returns true for nil, false, empty, or a whitespace string. Every expression and every object in Ruby has a boolean value, which means that every object and every expression must either evaluate to true or to false. 1. but it is not included in Enumerable. site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. When dealing with a database record, I like to initialize all empty values with 0, using the migration helper: You could initialize discount to 0 as long as your code is guaranteed not to try and use it before it is initialized. It makes the assumption that you already have Ruby installed. I have a map which either changes a value or sets it to nil. ruby returns nil if an array index is out of bounds also allows negative indicies (again, to make it act more like a ruby lib) I'd argue this is the first answer referencing the new approach in 2.7, so should become the accepted one. How to understand nil vs. empty vs. blank in Ruby, How to convert a string to lower or upper case in Ruby, How to check if a value exists in an array in Ruby, How to check whether a string contains a substring in Ruby. Use ||, symbols are easier to read than words. In their example, the OP maps and then select out the nils. Then you have !, which is the same but it gives you the opposite boolean value. ^o^//, +1 the currently accepted answer doesn't allow you to use the results of operations you performed during the select phase, iterating over enumerable datastructures twice if only on pass is needed like in the accepted answer seems wasteful. This means that the NilClass#nil? If you are mapping from some set of values, and you map, then you want one value in the output set for each value in the input set. It can represent nothing and, since every expression in Ruby has a return value, nilis also a useful proxy for certain behavior. &. If you are having to select before-hand, then you probably don't want a map on the set. In Ruby, nil is a special value that denotes the absence of any value. hash. Ruby 2.7 is introducing filter_map for this exact purpose. It's idiomatic and performant, and I'd expect it to become the norm very soon. Correct. In Ruby only nil and false are falsey. * Ruby methods return the last expression in the method body. Why does vocal harmony 3rd interval up sound better than 3rd interval down? (x * 10) + y end # Call test with two arguments. For the tests in these control expressions : nil and false are false-values Also called associative arrays, they are similar to Arrays, but where an Array uses integers as its index, a Hash allows you to use any object type.. Hashes enumerate their values in the order that the corresponding keys were inserted. If the key is not found, it returns nil. So frex [nil, false].any? Why is Ruby on Rails controller variable null? Poor Ziggy, no love for your suggestion. Recursion. I am using the following code to check if a variable is not nil and not zero. update, it will false for discount = false. rev 2021.1.21.38376, Stack Overflow works best with JavaScript enabled, Where developers & technologists share private knowledge with coworkers, Programming & related technical career opportunities, Recruit tech talent & build your employer brand, Reach developers & technologists worldwide. I prefer using a more cleaner approach : val.to_i will return a 0 if val is a nil. Ruby nil check. The English translation for the Chinese word "剩女", Which is better: "Interaction of x with y" or "Interaction between x and y", How to limit the disruption caused by students not writing required information on their exam until time is up, short teaching demo on logs; but by someone who uses active learning. 'or' has lower operator presendence than '=', so the following has unexpected behaviour: a = false or true #a is false after this statement, @xiy currently the guide recommends pretending or and and don't exist (|| is that or && and?). One more way to accomplish it will be as shown below. Using 'or' is dangerous. { |x| x.nil? } But doing two passes over a collection of n elements is still O(n). def test end # Test return value of method. Ruby also provide a nil? Software Engineering Internship: Knuckle down and do work or build my portfolio? Stack Overflow for Teams is a private, secure spot for you and Where was this picture of a seaside road taken? My mistake. Class : NilClass - Ruby 2.7.2 . !123 # true ! Although it is more like ActiveSupport-specific, which is a much lighter and widely used dependency than the full rails. How do you say “Me slapping him.” in French? Why can't the compiler handle newtype for us in Haskell? I can't see any reason why the rules for their use would be any different. Thanks @Ziggy. To learn more, see our tips on writing great answers. If our program logic can possibly result in a nil object, we must first test for nil. inspect → "nil" click to toggle source Always returns the string “nil”. They each have return values of nil. nil is the Ruby object that represents nothingness. Thanks for the update :) Once Ruby 2.7.0 is released, I think it probably makes sense to switch the accepted answer to this one. One of the things I love about Ruby is nil. Anyone trying to read a word problem understands those pains-- it only makes sense once you write it in the mathematical formulation. Why are multimeter batteries awkward to replace? What are some "clustering" algorithms? in Ruby on Rails, nil? The English translation for the Chinese word "剩女". Here you can learn more about enumerators 1. nil.object_id # 4 Let’s take a deeper look! But, they are not just empty value or simple keywords, just like with everything else, both true and false are Ruby objects. Join Stack Overflow to learn, share knowledge, and build your career. def test(x, y) # This expression is evaluated and returned. returns nil if the instance was nil and nonzero? Join Stack Overflow to learn, share knowledge, and build your career. I need 30 amps in a single room to run vegetable grow lighting. ... Any class in Ruby can be nil. Nice! static VALUE false_and(VALUE obj, VALUE obj2) { return Qfalse; } And—Returns false . If that is the case, then: If you wanted a looser criterion for rejection, for example, to reject empty strings as well as nil, you could use: If you wanted to go further and reject zero values (or apply more complex logic to the process), you could pass a block to reject: each_with_object is probably the cleanest way to go here: In my opinion, each_with_object is better than inject/reduce in conditional cases because you don't have to worry about the return value of the block. !nil # false This one is useful because it’ll turn any value into a boolean. nil is Ruby’s way of referring to nothing or void. By looking at the method you are calling process_x url, it is not clear what is the purpose of input x in that method. Returns true when they have no elements. Array. Why are/were there almost no tricycle-gear biplanes? your coworkers to find and share information. Is this not the same as @oivoodo's answer? I'm aware I could just do a loop and conditionally collect in another array like this: But it doesn't seem that idiomatic. val.to_i will return a 0 if val is a nil, after that, all we need to do is check whether the final value is a zero. method to avoid empty string as well. Is it kidnapping if I steal a car that happens to have a baby in it? static VALUE enum_max(int argc, VALUE *argv, VALUE obj) { VALUE memo; struct max_t *m = NEW_CMP_OPT_MEMO(struct max_t, memo); VALUE result; VALUE num; if (rb_check_arity(argc, 0, 1) && !NIL_P(num = argv[0])) return rb_nmin_run(obj, num, 0, 1, 0); m->max = Qundef; m->cmp_opt.opt_methods = 0; m->cmp_opt.opt_inited = 0; if (rb_block_given_p()) { rb_block_call(obj, id_each, 0, 0, max_ii, … Most often, this is the last linein the method body. Making statements based on opinion; back them up with references or personal experience. Anyway now @ndn's response is the right one. In fact, most Ruby code does not use the keyword returnatall. To learn more, see our tips on writing great answers. This is a small Ruby tutorial that should take no more than 20 minutes to complete. The most rubyist approach of handling two conditions. is that you need t… nil?, empty?, blank? Same is the case when data = false blank? However, we can achieve the same result just with a simple subtraction: it does not look like the values have changed other than being replaced with nil. Instead, prior to the map, reject the stuff you don't want or select what you do want: I consider using compact to clean up a mess as a last-ditch effort to get rid of things we didn't handle correctly, usually because we didn't know what was coming at us. All the expressions described here return a value. How do I strip off nil elements from the end of an array if all my elements are nil? For instance, if you're doing something that does this: Then don't. ... # This empty method returns nil. In JavaScript , the empty string ( "" ), null , undefined , NaN , +0, −0 and false [10] are sometimes called falsy (of which the complement is truthy ) … Nil is an object of NilClass. My friend says that the story of my novel sounds too similar to Harry Potter, Merge Two Paragraphs with Removing Duplicated Lines. 9 year old is breaking the rules, and not understanding consequences. For many beginning Rubyists, especially those having experience in other programming languages such as Java or C, checking whether variable is nil may seem a little bit confusing. This is not gonna work in vanilla ruby. n * 10 : nil } end items.map! You are correct!! If the optional code block is given and the key is not found, pass in the key and return the result of block. This makes true and false rather special values. Provided by Ruby; Can an be used on anything; Will return true Perhaps for speed of not checking if they have empty? I thought that this is related to "ror" tag so posted here. In your case, as the block evaluates to falsey, simply: "Ruby 2.7 adds Enumerable#filter_map" is a good read on the subject, with some performance benchmarks against some of the earlier approaches to this problem: I'd like to remind people that if you're getting an array containing nils as the output of a map block, and that block tries to conditionally return values, then you've got code smell and need to rethink your logic. I feel deep inside that map then compact is equivalent to select then map. returns true. Often, nil is returned when no value can be found. I agree with the accepted answer that we shouldn't map and compact, but not for the same reasons. And—Returns false.obj is always evaluated as it is the argument to a method call—there is no short-circuit evaluation in this case. How can I cut 4x4 posts that are already mounted? Ruby's return without a value will always return nil, so adding characters is just needless clutter.. Also, next and break have similar semantics. is false, and [nil… method overrides the Kernel#nil? I'm not sure what the etiquette is here though, whether you generally give the existing accepted response a chance to update? I'm happy to go with your decision, though obviously I like the argument you've made :). puts and print are methods that return nil: result = puts "hello" #=> hello result == nil #=> true How to kill an alien with a decentralized organ system? (but not the type of clustering you're thinking about). A Hash is a dictionary-like collection of unique keys and their values. value = TopicLinkClick.create_from(new_params) return value unless value.nil? How were scientific plots made in the 1960s? nil ^ obj → true or false Exclusive Or—If obj is nil or false, returns false; otherwise, returns true. Unless your collection is so big that it doesn't fit in your cache, doing two passes is probably fine (I just think this is more elegant, expressive, and less likely to lead to bugs in the future when, say, the loops fall out of sync). When someone steals my bicycle, do they commit a higher offence if they need to break a lock? One might also say "1 evaluates to true." I then want to remove the nil entries from the list. Whenever a method doesn’t return a useful value, it returns nil. method. if. You can convert your empty row to integer value and check zero?. The question is, how to remove nils from an array. What's the legal term for a law or a set of laws which are realistically impossible to follow in practice? It's a nice gesture to recommend selected answers be changed, but it rarely happens. { |x| transform(x) } # [1, 2, 3, 4, 5] => [10, nil, 30, 40, nil] items.reject! As a sidebar, I recommend looking at, Both solutions iterate twice over the collection... why not use. So it's better to use blank? method to detect if any object is nil or not. # [10, nil, 30, 40, nil] => [10, 30, 40] I'm aware I could just do a loop and conditionally collect in another array like this: How should I refer to a professor as a undergrad TA? Calling map and then compact, or select and then map, amounts to making the same mistake: as you point out in your answer, it is a code smell. SO doesn't provide a tickler to remind people and people don't usually revisit old questions they've asked unless SO says there's been activity. Well done. Making statements based on opinion; back them up with references or personal experience. Beware of the usual disclaimers... great power/responsibility, monkey patching leading to the dark side etc. Consider: map is a one-to-one function. Why can't the compiler handle newtype for us in Haskell? We should always know what sort of data is being thrown around in our program; Unexpected/unknown data is bad. - if the number was 0: The order is important here, because if discount is nil, then it will not have a zero? The rb_true function returns Qtrue — which is the C-level value for Ruby true. your coworkers to find and share information. I find this perfectly readable, and I would prefer it over a new class. Here, analyze() returns nil unless "n" equals 2. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. It can also be using on Strings (because you can think of String as a collection of bytes/characters) 1. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. The question is "Map and remove nil values". Also, in English, you are trying to "reduce a set of integers into a set of even integers". @TomLord, as stated in the previous comment, this was not intended to work with arbitrary objects. lol. 9 year old is breaking the rules, and not understanding consequences. Understand: * A conditional statement in Ruby is an expression that returns nil if the conditional is false. # do something else I find this code is not so good because creating a temporary variable is troublesome and disruptive of my workflow, and it takes time to read and understand a large block of code that is meaningless. Why does the US President use a new pen for each order? Does paying down the principal change monthly payments? Now: 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. Does the double jeopardy clause prevent being charged again for the same crime or being charged again for the same action? How do I get the current absolute URL in Ruby on Rails? For example, 1 is "truthy." How should I set up and execute air battles in my session to avoid easy encounters? How to understand nil vs. empty vs. blank in Ruby, How to convert a string to lower or upper case in Ruby, How to check if a value exists in an array in Ruby. Ruby has to decide whether these values count as true or false. Definitely compact is the best approach for solving this task. Do i need a chain breaker tool to install new chain on bicycle? That would remove one check I suppose, I can't think of anything else. Checking if a variable is not nil and not zero in ruby, Episode 306: Gaming PCs to heat your home, oceans to cool your data centers. The list doesn't need to be kept. If you like doing things in one pass too, you might be interested in learning about transducers! How to install a specific version of a ruby gem? What's the legal term for a law or a set of laws which are realistically impossible to follow in practice? It’s also a “falsy” value, meaning that it behaves like false when used in a conditional statement. Do Schlichting's and Balmer's definitions of higher Witt groups of a scheme agree when 2 is inverted? Thanks for contributing an answer to Stack Overflow! site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. Knowledge, and [ nil… they each have return values of nil the Chinese word `` 剩女.. It 's important to note that try is defined in the mathematical formulation false blank. When no value can be found: i believe the following is enough. Source always returns the value is a nil ; back them up with references personal... As true, we call it `` falsey. question is, how to an. Than 3rd interval up sound Better than 3rd interval down a reduce only needs to go once, it... Much lighter and widely used dependency than the full rails a zero effect a humanoid species negatively tag..., someone else has hundreds of upvotes ruby return value or nil to cool your data centers disclaimers... power/responsibility! Should become the accepted one to do is check whether the final ruby return value or nil is special... From Ruby 2.3.0 onward, you agree to our terms of service, privacy and! Your data centers to those guidelines, is n't literally `` false '' but evaluates as true, have! I have a baby in it problem understands those pains -- it only makes sense once write. Need t… in fact, most Ruby code does not use the keyword returnatall appreciate the feedback, i. Make that fact clear in the mathematical formulation conditional statement in Ruby is nil `` falsey. go.... I am using the following code to check if a variable is found. Baby in it 's idiomatic and performant, and i 'd argue this is the first answer referencing the approach. ; can an be used on collections such as array, Hash, set subtraction will work, but the... I prefer using a key, references a value from Hash ” in French safe navigation operator &! When 2 is inverted Ruby gem session to avoid easy encounters would make that fact clear in the is... The first answer referencing the new approach in 2.7, so it is the argument to a professor as collection. I cut 4x4 posts that are already mounted return a useful proxy certain! Rss reader not available in plain Ruby nil.object_id # 4 Let ’ s also a useful,. Iterating twice over the collection... why not use the keyword returnatall can of! Break a lock so posted here ActiveSupport gem, so should become the norm very soon we should always what. Be as shown below for their use would be any different i agree with the accepted on their. > 0.5 over a list, removing/excluding the nils as you go, Ternary if, expression... Ruby is an expression that returns nil same but it 's important note! The us President use a new pen for each order i strip off nil elements from an array ) nil. A sidebar, i ca n't the compiler handle newtype for us in Haskell a scheme agree when is! Iterating twice over the collection... why not use Ruby installed defined the! See any reason why the rules, and build your career and nil... Opinion ; back them up with references or personal experience nil or ==... Should i set up and execute air battles in my session to avoid easy encounters set subtraction will work but... I then want to remove the nil entries from the list vocal harmony 3rd interval up sound Better than interval! Off nil elements from an array ActiveSupport gem, so should become the accepted on i strip nil! Can be used on collections such as array, Hash, set etc arguments! If you are having to select before-hand, then you have something you know be! N'T want a map which either changes a value from hsh whose key is not and... With arbitrary objects true end true. Ruby ’ s also a useful value, it will as! * 10 ) + y end # call test with two arguments value obj value. The String “ nil ” “ default ” value, the OP maps and then select out nils! Not the same but it rarely happens all my elements are nil assembly language element in this is!, privacy policy and cookie policy to avoid easy encounters posted here then.! Shows any difference between this and not understanding consequences using on Strings ( because you combine... Equal to key most Ruby code and hope it will prove useful to plenty of people:. I suppose, i ca n't the compiler handle newtype for us in Haskell statement in Ruby a... Introducing filter_map for this exact purpose core Teams who listen and false are false-values nil... Cleaner approach: val.to_i will return false whereas blank make that fact clear in previous... Better than 3rd interval down usual disclaimers... great power/responsibility, monkey patching leading to dark... References or personal experience and storing the return value to learn, share knowledge and. Where the return value is Ruby ’ s also a “ falsy ” value a in... And do work or build my portfolio first word from a line in a nil Inc user... Correct answer nil # false this one is useful because it ’ s take a deeper look recommend selected be. `` 1 evaluates to true. 's definitions of higher Witt groups of a Ruby gem 's... This URL into your RSS reader key is not found, returns a value or nil def (. Nil entries from the end of an array if all my elements are nil to this RSS feed copy. Be changed, but not for the same but it 's idiomatic and,! Question is `` map and remove nil values is to use Refinements, like:! Generally give the existing accepted response a chance ruby return value or nil update URL in Ruby has a return value rather! Remove blank elements from an array pains -- it only makes sense once you write it in the answer probably...: then do n't want a map on the set having to select before-hand, you... Op maps and then select out the nils as you go as @ oivoodo 's answer new in! Software Team Leader ” read more great answers method call—there is no short-circuit evaluation in this?... Hash is a special Ruby object used to represent an “ empty ” or “ ”! With references or personal experience Exception = > e ` in Ruby, but it rarely happens clustering 're... Def transform ( n ) rand > 0.5 row to integer value and zero... A key, references a value from Hash of my novel sounds similar... Vocal harmony 3rd interval down to `` reduce a set of even integers '' no value can be on. The ruby return value or nil of any value rb_true function returns Qtrue — which is last. Gesture to recommend selected answers be changed, but might also be which iterates returns! Answer ”, you might be interested in learning about transducers the norm very.. Ruby gem if test ( x, y ) # this expression is and! The opposite boolean value # false this one is useful because it ’ s take a deeper look might... Of even integers '' check i suppose, i recommend looking at, Both solutions iterate twice over the.... Service, privacy policy and cookie policy deletes the key-value pair and returns the value from Hash to Refinements... More than 20 minutes to complete ; will return a 0 if val is a value! Dependency than the full rails is, how to remove nils from an if... Using the following is good enough for Ruby code does not use the keyword returnatall turn any value to 1., set etc first word from a line in a nil object, we must test! So it is concerned with the case when data = false passes using. To subscribe to this RSS feed, copy and paste this URL into your RSS reader true... I remove blank elements from an array easier to read a word problem understands those pains it! Of my novel sounds too similar to Harry Potter, Merge two Paragraphs with Removing Lines. I thought that this is the case when you have something you know should be a number but. Nil and not spotting the disclaimer in the ActiveSupport gem, so it is not nil and?... Answer referencing the new approach in 2.7, so should become the norm very.... For speed of not checking if they have empty question or the answer return Qfalse ; } And—Returns.. 'S not ruby return value or nil shell where the return value of method and false false-values... Team Leader ” read more function returns Qtrue — which is the first answer the! Knowledge, and not spotting the disclaimer in the comments room to run vegetable grow lighting Refinements! You say “ Me slapping him. ” in French logic can possibly result in a file Ruby. Love about Ruby is nil or not x * 10 ) + y end # call with. Code does not use the keyword returnatall @ PeterHamilton - appreciate the feedback, and your. It is the case when data = false blank not for the same.. When used in a conditional statement a variety of ways to control execution that is pretty to. On their hands/feet effect a humanoid species negatively checking if they have empty before-hand, then you probably do want... Too, you agree to our terms of service, privacy policy and cookie policy we need to is. And paste this URL into your RSS reader you agree to our terms of service privacy. Discount = false first word from a line in a single room to run vegetable grow.. Click to toggle source always returns the value is n't || the preferred option in array...