Repiki

1.How do you check if an element is present in an Enumerable using a custom condition?

exists?{|e| custom_condition(e)}

any?{|e| custom_condition(e)}

contains?{|e| custom_condition(e)}

has?{|e| custom_condition(e)}

2.What does the `each_with_index` method do?

Selects elements based on a given condition.

Counts the number of elements in the collection.

Transforms each element using a block.

Iterates over each element along with its index.

3.How can you remove nil values from an Enumerable?

reject_nil

remove_nil

exclude_nil

compact

4.What does the `collect` method do in Ruby Enumerables?

Counts the occurrences of a specific element.

Transforms each element using a block and returns a new array.

Groups consecutive elements based on a given block.

Filters elements based on a regular expression.

5.How can you check if all elements in an Enumerable are positive numbers?

positive?{|e| e.all?}

every?{|e| e.positive?}

all?(&:positive?)

is_positive?{|e| e}

6.What is the output of the following code?

arr = [1, 2, 3, 4, 5]
result = arr.select(&:even?).map { |x| x**2 }
puts result.join(',')

1,9,25

2,4

1,4,9,16,25

4,16

7.4. How can you find the index of the minimum element in an Enumerable?

index

min_index

find_index

min

8.What is the purpose of the `each_with_object` method in Enumerables?

Counts the occurrences of a specific element.

Transforms each element using a block.

Iterates over each element and accumulates a result with an initial object.

Returns the last element in the collection.

9.What will be printed by the following code?

arr = [1, 2, 3, 4, 5]
result = arr.reduce { |product, x| product * x }
puts result

120

15

30

0

10.How do you find the difference between two Enumerables in Ruby?

difference

diff

subtract

minus

11.What does the `cycle` method do in Enumerables?

Shuffles the elements randomly.

Repeats the collection a specified number of times.

Cycles through the elements and applies a block.

Repeats the collection indefinitely.

12.How can you convert an Enumerable of key-value pairs into a hash in Ruby?

to_h

hashify

convert_to_hash

to_hash

13.What is the output of the following code?

arr = [1, 2, 3, 4, 5]
result = arr.reverse_each.take(3)
puts result.join(',')

3,2,1

5,4,3

5,4,3,2,1

1,2,3

14.What does the `one?` method do in Enumerables?

Counts the number of elements in the collection.

Checks if all elements in the collection satisfy a given condition.

Checks if exactly one element in the collection satisfies a given condition.

Returns true if there is only one element in the collection.

15.What will be printed by the following code?

arr = [1, 2, 3, 4, 5]
result = arr.drop(2).cycle(2).to_a
puts result.join(',')

3,4,5,3,4,5

1,2,3,4,5

3,4,5,1,2,3,4,5

2,3,4,5,1,2

16.What is the purpose of the `zip` method in Ruby Enumerables?

Zips elements in random order.

Unzips an array of arrays into two separate Enumerables.

Combines corresponding elements from two Enumerables into an array of arrays.

Creates a zip file containing the Enumerables.

17.What does the `flat_map` method do in Ruby Enumerables?

Groups consecutive elements based on a given block.

Transforms each element using a block and flattens the result into a single array.

Splits the collection into two equal parts.

Counts the occurrences of a specific element.

18.What is the purpose of the `chunk_while` method in Enumerables?

Splits the collection into two equal parts.

Groups consecutive elements based on a given block until the block condition is false.

Counts the occurrences of a specific element.

Transforms each element using a block.

19.How do you concatenate two Enumerables in Ruby?

merge

combine

concat

join

20.How do you remove nil values from an Enumerable?

reject_nil

remove_nil

exclude_nil

compact

Enumerables IX