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age = 10 if age < 18 puts "You're too young to use this system" else puts "You can use this system" end
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The ternary operator makes it possible for an expression to contain a mini if/else statement. It s a construction that s entirely optional to use, and some developers are oblivious to its existence. However, because it can be useful to produce more compact code, it s worth learning early. Let s dive in with an example: age = 10 type = age < 18 "child" : "adult" puts "You are a " + type The second line contains the ternary operator. It starts by assigning the result of an expression to the variable, type. The expression is age < 18 "child" : "adult". The structure is as follows: <condition> <result if condition is true> : <result if condition is false> In our example, age < 18 returns true, so the first result, "child", is returned and assigned to type. However, if age < 18 were to be false, "adult" would be returned. Consider an alternative: age = 10 type = 'child' if age < 18 type = 'adult' unless age < 18 puts "You are a " + type The double comparison makes it harder to read. Another alternative is to use the multiline if/else option: age = 10 if age < 18 type = 'child' else type = 'adult' end puts "You are a " + type The ternary operator shows its immediate benefit in its conciseness, and as it can be used to build expressions on a single line, you can use it easily in calls to methods or within other expressions where if statements would be invalid. Consider this even simpler version of the first example from this section: age = 10 puts "You are a " + (age < 18 "child" : "adult")
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Sometimes it s desirable to make several comparisons with the same variable at the same time. You could do this with the if statement, as covered previously: fruit color color color = = = = "orange" "orange" if fruit == "orange" "green" if fruit == "apple" "yellow" if fruit == "banana"
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If you want to use else to assign something different if fruit is not equal to either orange, apple, or banana, it will quickly get messy, as you d need to create an if block to check for the presence of any of these words, and then perform the same comparisons as earlier. An alternative is to use elsif, meaning else if : fruit = "orange" if fruit == "orange" color = "orange" elsif fruit == "apple" color = "green" elsif fruit == "banana" color = "yellow" else color = "unknown" end elsif blocks act somewhat like else blocks, except that you can specify a whole new comparison expression to be performed, and if none of those match, you can specify a regular else block to be executed. A variant of this technique is to use a case block. Our preceding example, with a case block, becomes the following: fruit = "orange" case fruit when "orange" color = "orange" when "apple" color = "green" when "banana" color = "yellow" else color = "unknown" end This code is similar to the if block, except that the syntax is a lot cleaner. A case block works by processing an expression first, and then by finding a contained when block that matches the result of that expression. If no matching when block is found, then the else block within the case block is executed instead.
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