1.
Is there an equivalent of “continue” in Ruby?
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Xamarin Ruby interview questions.
Only challenges
- 2.
Which core object includes the "Kernel" module?
Answer:
- 3.
What is an object?
Answer:
- 4.
What can you say about an identifier that begins with a capital letter?
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- 5.
What are rubygems?
Answer:
- 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
Answer:
- 24.
Why might you use #each instead of for/in?
Answer:
- 25.
What is a predicate in the context of Ruby method naming conventions?
Answer:
- 26.
What is the difference between a class variable and a class instance variable?
Answer:
- 27.
What is a module? Can you tell me the difference between classes and modules?
Answer:
- 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?
Answer:
- 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 #===?
Answer:
- 35.
What is the difference between nil and false in Ruby?
Answer:
- 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.
Answer:
- 38.
What will be the values of ...
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- 39.
How do you remove nil values in array using ruby?
Answer:
- 40.
What are two uses of ranges?
Answer:
- 41.
What are some disadvantages of a case statement versus repeated elsif statements?
Answer:
- 42.
What is an iterator?
Answer:
- 43.
How is the invocation of a private method different than the invocation of a public method from within its defining class?
Answer:
- 44.
Describe a closure in Ruby
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- 45.
What is the difference between calling "super" and calling "super()"
Answer:
- 46.
What is the main difference between procs and lambdas?
Answer:
- 47.
Explain this ruby idiom: a ||= b
Answer:
- 48.
What is a Proc?
Answer:
- 49.
What is the difference between throw/catch and raise/rescue?
Answer:
- 50.
When might you use the do/end syntax versus using the curly bracket syntax for a block?
Answer:
- 51.
How does block invocation differ from method invocation?
Answer:
- 52.
What is the difference between Module#remove_method and Module#undef_method?
Answer:
- 53.
Why might you want to avoid using string literals within loops?
Answer:
- 54.
Why can you safely use a string as a hash key, even though a string is mutable?
Answer:
- 55.
What is the difference between Kernel#require and Kernel#load?
Answer:
- 56.
What is the difference between Array#map and Array#each?
Answer:
- 57.
What will be the value of ...
Answer:
- 58.
What is the difference between #== and #eql??
Answer:
- 59.
Why might you want to alias a method?
Answer:
- 60.
What is the difference between #== and #equal??
Answer:
- 61.
What does a bang ! at the end of a method signify?
Answer:
- 62.
What will val1 and val2 equal after the code below is executed? Explain your answer.
Answer:
- 63.
Can you tell me the three levels of method access control for classes and modules? What do they imply about the method?
Answer:
- 64.
Which operator must be defined in order to implement the Comparable module?
Answer:
- 65.
What does self mean?
Answer:
- 66.
Explain redo vs. retry usage
Answer:
- 67.
What is the difference between Proc invocation and lambda invocation?
Answer:
- 68.
Explain the difference between
Answer:
- 69.
What is the value of the variable "upcased" in the below piece of code?
Answer:
- 70.
What happens if a block is passed two arguments but only accepts one argument?
Answer:
- 71.
Why doesn't Ruby support method overloading?
Answer:
- 72.
What is an eigenclass?
Answer:
- 73.
What is the difference between Object#dup and #clone?
Answer:
- 74.
What is the difference between BasicObject#instance_eval and BasicObject#instance_exec?
Answer:
- 75.
When might you encounter a LocalJumpError?
Answer:
- 76.
What is the primary difference in these two code snippets?
Answer:
- 77.
How exactly does it work?
Answer:
- 78.
Is a block an object?
Answer:
- 79.
Is a method an object?
Answer:
- 80.
What happens to a constant which is not assigned?
Answer:
- 81.
What will be the result of each of the following lines of code
Answer:
- 82.
What is the differnece between extend and include in ruby?
Answer:
- 83.
Write a single line of Ruby code that prints the Fibonacci sequence of any length as an array.
Answer:
- 84.
Is the line of code below valid Ruby code? If so, what does it do?
Answer:
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