Split and join methods in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to split the string into an array of words.

Ruby

words = "hello world ruby".[1](" ")

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

Ajoin

Bconcat

Csplit

Dreplace

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'join' instead of 'split' which combines arrays into strings.

Forgetting to provide a separator.

The split method divides a string into an array based on the given separator.

2fill in blank

medium

Complete the code to join the array elements into a single string separated by commas.

Ruby

result = ["apple", "banana", "cherry"].[1](",")

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Aselect

Bsplit

Cmap

Djoin

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'split' which breaks strings instead of joining arrays.

Not providing a separator string.

The join method combines array elements into a string with the given separator.

3fill in blank

hard

Fix the error in the code to split the string by commas.

Ruby

items = "red,green,blue".[1](",")

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

Ajoin

Bsplit

Cconcat

Dreplace

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'join' which is for arrays, not strings.

Using 'replace' which changes content but does not split.

To break a string into parts by commas, use split with ',' as separator.

4fill in blank

hard

Fill both blanks to create a hash where keys are words and values are their lengths for words longer than 3 letters.

Ruby

lengths = {}; words.each { |word| lengths[[1]] = [2] if word.length > 3 }

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Aword

Bword.length

Cword.size

Dword.upcase

Attempts:

3 left

💡 Hint

Common Mistakes

Using word.size instead of word.length (both work but only one is correct here).

Using word.upcase which changes the word but is not length.

The key should be the word itself, and the value should be its length using word.length.

5fill in blank

hard

Fill all three blanks to create a string of uppercase words joined by a dash, only including words longer than 3 letters.

Ruby

result = words.select { |w| w.length > [1] }.map { |w| w.[2] }.[3]("-")

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

A3

Bupcase

Cjoin

Ddowncase

Attempts:

3 left

💡 Hint

Common Mistakes

Using length > 4 instead of > 3 changes the filter.

Using downcase instead of upcase.

Using split instead of join at the end.

We select words longer than 3 letters, convert them to uppercase, then join with dashes.