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Discover Ruby Programming Through Fun Examples

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Introduction

Motivation Introduction Write Your First Ruby Program Rhythm for Working on the Exercises Type of Errors Quiz: Programming Basics

Printing Shapes

Print Out a Triangle Solution: Printing a Triangle Print Out a Half Diamond Solution: Printing a Half Diamond Print Out a Diamond Shape Solution: Printing a Diamond Shape Print a Big Diamond of Variable Size Solution: Printing a Diamond of Variable Size Exercise: Printing Shapes Solutions: Printing Shapes Exercises Quiz: Printing Shapes

Interacting with the Command-Line

Simple Calculator to Perform Addition Solution: Simple Calculator to Perform Addition Addition Quiz Game Solution: Addition Quiz Game Subtraction Quiz Game Solution: Subtraction Quiz Game Number Guessing Game Solution: Number Guessing Game Exercise: Counting to 21 Solution: Counting to 21 Quiz: Interacting with the Command-Line Interface

Composite Data Types

Introduction to Array and Hash Sorting Children's Names Solution: Sorting Children's Names Get Character from Alphabetical Position Solution: Get Character from Alphabetical Position Calculate Average Solution: Calculate Average What Makes 100% In Life?Solution: What Makes 100% In Life?Exercise: Implement Letter Guessing Game Solution: Implement Letter Guessing Game Exercise: Find the Median Solution: Find the Median Quiz: Composite Data Types

Useful Utility Programs

Convert Fahrenheit to Celsius Solution: Convert Fahrenheit to Celsius Personal Income Tax Calculator Solution: Personal Income Tax Calculator Word Count Solution: Word Count Generate Lotto Numbers Solution: Generate Lotto Numbers Number Sorting Solution: Number Sorting Exercise: Number Base Conversion Solution: Number Base Conversion Exercise: Convert Word to Phone Number Solution: Convert Word to Phone Number Quiz: Useful Utility Programs

Fun Math

Finding Divisors Solution: Finding Divisors Finding the Highest Common Factor Solution: Finding the HCF Finding the Least Common Multiple Solution: Finding the LCM Finding Prime Numbers Solution: Finding Prime Numbers Fibonacci Sequence Solution: Fibonacci Sequence Consecutive Sums Solution: Consecutive Sums Exercise: Compute Pi Solution: Compute Pi Quiz: Fun Math

Methods

Introduction to Methods in Ruby Finding the HCF by Using a Method Solution: Finding the HCF by Using a Method Generate Lotto Numbers Using a Method Solution: Generating Lotto Numbers Using a Method LCM of Multiple Numbers Using a Method Solution: LCM of Multiple Numbers Using a Method Check If a String Is a Palindrome Solution: Check If a String Is a Palindrome Quiz: Methods

File and Network

Preliminaries: Linux File Structure and Commands

Calculate Average Score by Reading a File

Solution: Calculate Average Score by Reading a File

Count Words and Lines in a Text File

Solution: Count Words and Lines in a Text File

Mail Merge Birthday Invitation Cards

Solution: Mail Merge Birthday Invitation Cards

Solution: Rename Files

Meal Categories

Solution: Meal Categories

Send Individual Thank You Emails

Solution: Sending Individual Thank You Emails

Exercise: Grades Histogram

Solution: Grades Histogram

Quiz: File and Network

Object-Oriented Programming

Introduction to Objects and Classes in Ruby Design a Basic Calculator Solution: Design a Basic Calculator Age of Teacher and Students Solution: Age of Teacher and Students Calculate Sales Tax Solution: Calculate Sales Tax Library System Solution: Library System Sunflower vs Zombies Game Simulation Solution: Sunflower vs. Zombies Game Simulation Exercise: Calculate Shape Area Solution: Calculate Shape Area Quiz: Object-Oriented Programming

Classic Puzzles

Gearing Up for More Problem Solving Google Labs Aptitude Test Solution: Google Labs Aptitude Test Fibonacci and HCF (Recursion)Solution: Fibonacci and HCF (Recursion)Calculate Compound Interest Solution: Calculate Compound Interest Farmer Crosses River Puzzle Solution: Farmer Crosses River Puzzle Cryptic Math Equation (Backtracking)Solution: Cryptic Math Equation (Backtracking)Exercise: Google Labs Aptitude Test (Recursion)Solution: Google Labs Aptitude Test (Recursion)Exercise: Tower of Hanoi Solution: Tower of Hanoi Exercise: Knight's Tour Solution: Knight's Tour Exercise: Eight Queens Puzzle Solution: Eight Queens Puzzle Quiz: Classic Puzzles

Web Test Automation

Introduction to Web Test Automation Selenium for Writing Test Scripts Sample Selenium WebDriver Script Complete Test with Verification

Beyond This Course

Ruby in a Nutshell

Key Highlights Object-oriented Programming in Ruby File Handling in Ruby

Appendix

Interactive Ruby Shell (IRB)Ruby on Windows Ruby on Mac OS X Install Ruby Gems Generate Application Password

Rename Files

Learn about regular expressions in Ruby and use them to rename files in a directory.

We'll cover the following

Problem
Purpose
Analyze
Hints
DIY

Problem

Write a program to rename the following files in a directory, so that the files are always shown in alphabetical order and without spaces:

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