CSV library basics in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to require the CSV library.

Ruby

require '[1]'

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

Anet/http

Bcsv

Cjson

Ddate

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'CSV' with uppercase letters.

Forgetting to require the library before using it.

The CSV library is included by requiring 'csv'. This makes CSV methods available.

2fill in blank

medium

Complete the code to read a CSV file named 'data.csv' and print each row.

Ruby

CSV.foreach('data.csv') do |[1]|
  puts [1].inspect
end

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

Aline

Bcsv

Cfile

Drow

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'file' which is the whole file, not a row.

Using 'csv' which is the library name, not the row variable.

CSV.foreach reads each row and yields it to the block as 'row'.

3fill in blank

hard

Fix the error in the code to parse CSV data from a string.

Ruby

data = "name,age\nAlice,30\nBob,25"
rows = CSV.[1](data)
rows.each { |row| puts row[0] }

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

Aparse

Bread

Copen

Dforeach

Attempts:

3 left

💡 Hint

Common Mistakes

Using CSV.foreach which expects a filename.

Using CSV.read which also expects a file.

CSV.parse reads CSV data from a string. CSV.foreach is for files.

4fill in blank

hard

Fill both blanks to create a hash from CSV rows with headers.

Ruby

CSV.foreach('data.csv', headers: true) do |[1]|
  person = [2].to_h
  puts person
end

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

Arow

Bline

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names in the block and inside the block.

Forgetting to convert the row to a hash.

Each row is yielded as 'row'. Calling to_h converts it to a hash with headers as keys.

5fill in blank

hard

Fill all three blanks to write CSV data with headers.

Ruby

CSV.open('output.csv', 'w', write_headers: true, headers: [[1]]) do |csv|
  csv.[2]([[3]])
end

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

A"name", "age"

Bputs

C"Alice", 30

D <<

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'puts' instead of '<<' to add rows.

Not providing headers as strings.

Not passing row data as an array.

Headers are given as an array of strings. To add a row, use the '<<' operator with an array of values.