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Ruby interview questions

Ruby interview questions.

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  • 1.

    Is there an equivalent of “continue” in Ruby?

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  • 2.

    Which core object includes the "Kernel" module?

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  • 3.

    What is an object?

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  • 4.

    What can you say about an identifier that begins with a capital letter?

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  • 5.

    What are rubygems?

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  • 6.

    What is a class?

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  • 7.

    What is the highest level in the object model?

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  • 8.

    Is everything in Ruby an object?

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  • 9.

    Why Ruby is known as a language of flexibility?

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  • 10.

    How might you specify a default value for a hash?

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  • 11.

    Explain some differences between Ruby and Python

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  • 12.

    Are instance methods public or private?

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  • 13.

    Are class variables inherited?

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  • 14.

    Can you call a private method outside a Ruby class using its object?

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  • 15.

    There are three ways to invoke a method in ruby. Can you give me at least two?

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  • 16.

    What is the return value for ...

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  • 17.

    What is the difference between private and protected methods?

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  • 18.

    What is the difference between an Instance Variable and a Class Variable?

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  • 19.

    Is Ruby a strongly typed or a weakly typed language?

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  • 20.

    Explain redo statement in Ruby

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  • 21.

    What is duck typing and how does it pertain to Ruby?

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  • 22.

    Why are symbols typically used as hash keys instead of strings?

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  • 23.

    Explain each of the following operators and how and when they should be used

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  • 24.

    Why might you use #each instead of for/in?

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  • 25.

    What is a predicate in the context of Ruby method naming conventions?

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  • 26.

    What is the difference between a class variable and a class instance variable?

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  • 27.

    What is a module? Can you tell me the difference between classes and modules?

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  • 28.

    Is Ruby a statically typed or a dynamically typed language?

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  • 29.

    Why might you use Hash#fetch over Hash#[] when querying values in a hash?

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  • 30.

    What are two uses of the splat operator?

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  • 31.

    What is a DSL and how does it pertain to Ruby?

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  • 32.

    What does it mean to coerce an object? Why would you do it?

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  • 33.

    Which of the expressions listed below will result in "false"?

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  • 34.

    What is the difference between #== and #===?

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  • 35.

    What is the difference between nil and false in Ruby?

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  • 36.

    Check if a value exists in an array in Ruby

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  • 37.

    Write a function that sorts the keys in a hash by the length of the key as a string.

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  • 38.

    What will be the values of ...

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  • 39.

    How do you remove nil values in array using ruby?

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  • 40.

    What are two uses of ranges?

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  • 41.

    What are some disadvantages of a case statement versus repeated elsif statements?

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  • 42.

    What is an iterator?

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  • 43.

    How is the invocation of a private method different than the invocation of a public method from within its defining class?

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  • 44.

    Describe a closure in Ruby

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  • 45.

    What is the difference between calling "super" and calling "super()"

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  • 46.

    What is the main difference between procs and lambdas?

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  • 47.

    Explain this ruby idiom: a ||= b

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  • 48.

    What is a Proc?

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  • 49.

    What is the difference between throw/catch and raise/rescue?

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  • 50.

    When might you use the do/end syntax versus using the curly bracket syntax for a block?

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  • 51.

    How does block invocation differ from method invocation?

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  • 52.

    What is the difference between Module#remove_method and Module#undef_method?

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  • 53.

    Why might you want to avoid using string literals within loops?

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  • 54.

    Why can you safely use a string as a hash key, even though a string is mutable?

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  • 55.

    What is the difference between Kernel#require and Kernel#load?

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  • 56.

    What is the difference between Array#map and Array#each?

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  • 57.

    What will be the value of ...

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  • 58.

    What is the difference between #== and #eql??

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  • 59.

    Why might you want to alias a method?

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  • 60.

    What is the difference between #== and #equal??

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  • 61.

    What does a bang ! at the end of a method signify?

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  • 62.

    What will val1 and val2 equal after the code below is executed? Explain your answer.

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  • 63.

    Can you tell me the three levels of method access control for classes and modules? What do they imply about the method?

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  • 64.

    Which operator must be defined in order to implement the Comparable module?

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  • 65.

    What does self mean?

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  • 66.

    Explain redo vs. retry usage

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  • 67.

    What is the difference between Proc invocation and lambda invocation?

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  • 68.

    Explain the difference between

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  • 69.

    What is the value of the variable "upcased" in the below piece of code?

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  • 70.

    What happens if a block is passed two arguments but only accepts one argument?

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  • 71.

    Why doesn't Ruby support method overloading?

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  • 72.

    What is an eigenclass?

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  • 73.

    What is the difference between Object#dup and #clone?

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  • 74.

    What is the difference between BasicObject#instance_eval and BasicObject#instance_exec?

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  • 75.

    When might you encounter a LocalJumpError?

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  • 76.

    What is the primary difference in these two code snippets?

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  • 77.

    How exactly does it work?

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  • 78.

    Is a block an object?

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  • 79.

    Is a method an object?

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  • 80.

    What happens to a constant which is not assigned?

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  • 81.

    What will be the result of each of the following lines of code

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  • 82.

    What is the differnece between extend and include in ruby?

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  • 83.

    Write a single line of Ruby code that prints the Fibonacci sequence of any length as an array.

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  • 84.

    Is the line of code below valid Ruby code? If so, what does it do?

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