Hash methods (keys, values, each) in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to get all keys from the hash.

Ruby

my_hash = {a: 1, b: 2, c: 3}
keys = my_hash.[1]
puts keys

Drag options to blanks, or click blank then click option'

Akeys

Bvalues

Ceach

Dlength

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'values' instead of 'keys' returns the values, not keys.

Using 'each' returns an enumerator, not an array of keys.

The keys method returns an array of all keys in the hash.

2fill in blank

medium

Complete the code to get all values from the hash.

Ruby

my_hash = {x: 10, y: 20, z: 30}
vals = my_hash.[1]
puts vals

Drag options to blanks, or click blank then click option'

Akeys

Bvalues

Ceach_key

Dlength

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'keys' returns keys, not values.

Using 'each_key' returns an enumerator for keys, not values.

The values method returns an array of all values in the hash.

3fill in blank

hard

Fix the error in the code to print each key and value pair.

Ruby

my_hash = {name: 'Alice', age: 30}
my_hash.[1] do |key, value|
  puts "#{key}: #{value}"
end

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Akeys

Bvalues

Ceach

Dmap

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'keys' or 'values' returns arrays, not pairs.

Using 'map' returns a new array, not just iteration.

The each method iterates over each key-value pair in the hash.

4fill in blank

hard

Fill both blanks to create a hash of word lengths for words longer than 3 letters.

Ruby

words = ['cat', 'house', 'tree', 'a', 'dog']
lengths = {}
words.each do |word|
  if word.length [2] 3
    lengths[word] = word[1]
  end
end
puts lengths

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A.length

B>

C<

D==

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' instead of '>' filters shorter words.

Forgetting to use '.length' to get word length.

Use .length to get the length of each word and > to filter words longer than 3 letters.

5fill in blank

hard

Fill all three blanks to create a hash with uppercase keys and values greater than 10.

Ruby

data = {"a": 5, "b": 15, "c": 25}
result = {}
data.[3] do |k, v|
  if v > 10
    result[[1]] = [2]
  end
end
puts result

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Ak.upcase

Bv

Ceach

Dk

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'k' instead of 'k.upcase' keeps keys lowercase.

Using 'map' instead of 'each' changes the return type.

Use each to iterate, k.upcase for uppercase keys, and v for values.