Array slicing and ranges in Ruby - Mini Project: Build & Apply

Array slicing and ranges

📖 Scenario: You are working with a list of daily temperatures recorded over a week. You want to extract specific parts of this list to analyze temperature trends.

🎯 Goal: Learn how to use array slicing and ranges in Ruby to select parts of an array.

📋 What You'll Learn

Create an array called temperatures with exact values for 7 days

Create a variable called start_day to mark the beginning index for slicing

Use array slicing with a range to get a subarray of temperatures

Print the sliced array to show the selected temperatures

💡 Why This Matters

🌍 Real World

Selecting parts of data from a list is common when analyzing time series like temperatures, sales, or website visits.

💼 Career

Understanding array slicing and ranges helps in data processing, filtering, and preparing data for reports or visualizations.

1

Create the temperatures array

Create an array called temperatures with these exact values: 22, 24, 19, 23, 25, 20, 18

Ruby

# Create the temperatures array with 7 values
# Your code here

Need a hint?

Use square brackets [] to create an array and separate values with commas.

2

Set the start day index

Create a variable called start_day and set it to 2 to mark the starting index for slicing

Ruby

temperatures = [22, 24, 19, 23, 25, 20, 18]
# Create start_day variable and set it to 2
# Your code here

Need a hint?

Just assign the number 2 to the variable start_day.

3

Slice the array using a range

Create a variable called selected_temps and assign it the slice of temperatures from start_day to index 4 using a range

Ruby

temperatures = [22, 24, 19, 23, 25, 20, 18]
start_day = 2
# Slice temperatures from start_day to 4 and assign to selected_temps
# Your code here

Need a hint?

Use array[start..end] syntax to slice with a range.

4

Print the selected temperatures

Write a puts statement to print the selected_temps array

Ruby

temperatures = [22, 24, 19, 23, 25, 20, 18]
start_day = 2
selected_temps = temperatures[start_day..4]
# Print selected_temps
# Your code here

Need a hint?

Use puts selected_temps.inspect to print the array in a readable format.