Pipeline operator concept in Ruby - Mini Project: Build & Apply

Using the Pipeline Operator in Ruby

📖 Scenario: Imagine you are processing a list of numbers to prepare a report. You want to square each number, then convert it to a string with a prefix, and finally collect all results.

🎯 Goal: Build a Ruby program that uses the pipeline operator |> to chain methods for transforming a list of numbers step-by-step.

📋 What You'll Learn

Create an array called numbers with the values [1, 2, 3, 4, 5].

Create a variable called prefix and set it to the string "Number: ".

Use the pipeline operator |> to square each number, then convert each to a string with the prefix.

Print the final transformed array.

💡 Why This Matters

🌍 Real World

The pipeline operator helps write clear and readable code when processing data step-by-step, like transforming lists of values in reports or data analysis.

💼 Career

Understanding the pipeline operator is useful for Ruby developers to write clean, functional-style code that is easy to maintain and extend.

1

Create the initial array of numbers

Create an array called numbers with the exact values [1, 2, 3, 4, 5].

Ruby

# Create the array called numbers with [1, 2, 3, 4, 5]
numbers = []  # Your code here

Need a hint?

Use square brackets [] to create an array with the numbers 1 through 5.

2

Add a prefix string variable

Create a variable called prefix and set it to the string "Number: ".

Ruby

numbers = [1, 2, 3, 4, 5]
# Create the prefix variable with the string "Number: "
prefix = ""  # Your code here

Need a hint?

Use = to assign the string "Number: " to the variable prefix.

3

Use the pipeline operator to transform numbers

Use the pipeline operator |> to create a new array called result that squares each number in numbers, then converts each squared number to a string prefixed by prefix. Use map twice in the chain.

Ruby

numbers = [1, 2, 3, 4, 5]
prefix = "Number: "
# Use the pipeline operator to create result with squared and prefixed strings
result = nil  # Your code here

Need a hint?

Use |> to chain two map calls: first to square, second to add prefix and convert to string.

4

Print the final result

Write a puts statement to print the result array.

Ruby

numbers = [1, 2, 3, 4, 5]
prefix = "Number: "
result = numbers |> (->(arr) { arr.map { |n| n * n } }) |> (->(arr) { arr.map { |n| prefix + n.to_s } })
# Print the result array
# Your code here

Need a hint?

Use puts result to print each element of the array on its own line.