String slicing and indexing in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to get the first character of the string.

Ruby

word = "hello"
first_char = word[[1]]
puts first_char

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

A0

B1

C-1

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Using 1 instead of 0 for the first character index.

Using -1 which gives the last character.

In Ruby, string indexing starts at 0, so word[0] gives the first character.

2fill in blank

medium

Complete the code to get the substring "ell" from the string.

Ruby

word = "hello"
substring = word[[1]]
puts substring

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

A1..3

B2..4

C0..2

D3..5

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong range that misses or adds extra characters.

Using exclusive ranges instead of inclusive.

The substring "ell" starts at index 1 and ends at index 3 inclusive.

3fill in blank

hard

Fix the error in the code to get the last two characters of the string.

Ruby

word = "world"
last_two = word[[1]]
puts last_two

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

A4..5

B3..4

C-1, 2

D-2, 2

Attempts:

3 left

💡 Hint

Common Mistakes

Using a range that goes out of bounds.

Using -1 as start index with length 2 which is invalid.

Using negative index -2 with length 2 extracts the last two characters.

4fill in blank

hard

Fill both blanks to get the substring "cat" from the string.

Ruby

word = "concatenate"
substring = word[[1], [2]]
puts substring

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

A3

B4

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong start index.

Using wrong length that cuts substring incorrectly.

The substring "cat" starts at index 3 and has length 3.

5fill in blank

hard

Fill all three blanks to create a hash with word lengths for words longer than 3 characters.

Ruby

words = ["dog", "elephant", "cat", "bird"]
lengths = words.each_with_object({}) { |[3], hash| hash[[1]] = [3].[2] if [3].[2] > 3 }
puts lengths

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

Aword

Blength

Dw

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names inconsistently.

Using wrong property to get length.

We use 'word' as key, 'word.length' as value, and iterate with 'word' over words.