What you would learn in Learn Enough Ruby to be Dangerous: A Tutorial Introduction to Programming with Ruby course?
Programmers appreciate Ruby because of its beauty as well as its power and flexibility, and that's the reason it was chosen to be its Ruby on Rails framework, which launched websites that range from Shopify to Coinbase. You'll be awed by Ruby as well. However, you don't have to know "everything" about it, only how to utilize it effectively to solve the real issues. The best-selling author and renowned Rails development expert Michael Hartl gets you started writing modern and practical Ruby programs as quickly as possible, with particular attention to the simple tools used by everyday software developers. You'll learn to utilize Ruby interactively as well as write shell scripts using Ruby and then use Ruby to create simple, dynamic web-based applications.
Even if you're brand new to programming, Hartl assists you to quickly improving your technical skills as you develop an object-oriented and functional programming knowledge. Create and publish an independent Ruby application (a gem) and then use the gem to create and deploy an interactive web application using The Sinatra framework. Specific exercises will help you grasp the most essential aspects of programming and not waste time on things professionals do not care about. In a few years, you'll feel like you're born with this knowledge--and then you'll be suddenly risky.
Find Out How
- Create a basic "hello, world" program with a variety of different methods
- Create a simple, dynamic Ruby application for the internet
- Utilize strings, arrays, or other native objects
- Define the functions
- Make use of Ruby for functional programming.
- Utilize test-driven development
- Create an executable shell script
- Create a complete Ruby web-based application to detect palindromes
Lesson 1: Hello, World!
Lesson 1 starts at the beginning by requiring you to create four accessible "hello, world" programs using a variety of methods. "hello, world" is to ensure that your system is configured correctly to execute the easy program that prints the word "hello, world!" to the screen. The first step is to write the program to show a greeting on a command line terminal beginning with the REPL known as the IRB (interactive Ruby), then from an image file, and finally using the shell script. In the end, you create and test a basic proof-of-concept web-based application made using an application framework called the Sinatra web platform.
Lesson 2: Strings
Lesson 2 covers strings, possibly the most significant information structure found on the internet because web pages are made up of characters and strings sent to and through the browser. Numerous other types of programs require the manipulation of strings as well. Therefore, strings are the ideal starting point for the Ruby learning journey. The course starts by discussing the definition of strings and how they can be created, including double-quoted and single-quoted strings. Then, you learn to join or concatenate strings from one to the other. Then, you are taught how to print directly to the screen using the terminal windows. This is where you are introduced to your first example of Ruby variable boolean and control flow. In addition, you will learn to iterate over strings using for loops. This allows users to read strings one character at a.
Lesson 3: Arrays
Then, in Lesson 2, you learned that strings are composed of a sequence of characters in a specific order. Then, in Lesson 3, you learn about the array data type, the standard Ruby container that can be used to store arbitrary elements in a particular arrangement. The lesson begins by explicitly connecting arrays and strings using the method of splitting strings, as well as learning about different array techniques throughout the course. After mastering the art of splitting strings, you are taught how to access the elements of the array that result and discover how the exact syntax can be used for strings, enhancing the connection between these two types of data. After that, you will learn various array techniques, starting with selecting a single element and multiple elements simultaneously with array slicing. These include the helpful range datatype and a method that makes use of range indices to pick the final element of an array. You also learn to sort arrays. If you've created an algorithm for sorting by hand you'll find Ruby is a breeze. Additionally, you learn reverse arrays, an ability you'll apply in the future in the learning process of identifying palindromes. You will then learn to join and eliminate elements of an array with push and pop, and also an overview of the shovel operator. Learn how to undo a split in a string by joining an array. In the final lesson, you are taught how to loop through arrays with the same type of for loop described during Lesson 2, which is useful for preparing for advanced techniques to be taught during Lessons 5 and 6.
Lesson 4 4. Other Native objects
After having examined arrays and strings Lesson 4 continues with a look at other essential Ruby objects. This allows gaining knowledge about dates, math regular expressions, and hashes. Like many software languages, Ruby offers a wide variety of mathematical operations from the beginning, including multiplication, subtraction and division. Additionally, it comes with an algebra library that supports more sophisticated operations like trigonometric functions and logarithms. It also teaches you how to handle dates and times in Ruby like getting the year, day or precise time. This gives you the first experience with the brand new function, a 'constructor' function which is the most common Ruby method of creating the object you want to create. This course provides an overview of the highly effective regular expressions topic, which are briefly discussed in Learn enough developer tools to be Risky within the context of text editors as well as using the command grep. Regexes are often referred to as regexes, which means short regular expressions, they can be a very powerful miniature language that is used for searching for the patterns of text. You will learn to make use of regexes to swiftly search for strings that match things like five digits on rows, which will match the standard United States ZIP codes. The course concludes by introducing hashes to Ruby. These objects are used to construct collections of key-value pairs, often referred to as by the name of associative arrays. They are similar to regular arrays but use strings instead of numbers for indices. It is possible to use this object type when writing your first significant Ruby program using a shell script to identify the words unique to an article.
Lesson 5: Blocks and Functions
Through this course, Ruby functions have been often mentioned. In Lesson 5, you finally learn to create functions of your own. The result lets us be more flexible as programmers and allows us to use powerful methods like every method, which is discussed in this lesson, as well as functional programming which is the topic in Lesson 6. The lesson begins with functions that are part of the read-eval-print loop, also known as the REPL. Then, you will learn to place your definitions of functions in an appropriate file to be used in a basic Sinatra web-based application. This lesson also covers how to utilize multiple functions within rows, a method called method chaining. Method chaining allows you to create an understanding of what is a palindrome to find out if a string has the same for both directions. The lesson concludes by a brief discussion of various methods of looping through arrays, which is often a more efficient way to process array elements as opposed to the for loop that was introduced during Lesson 2. This lesson is the first glimpse of blocks, which is a feature Ruby has in common with just some other languages, and that are the foundation for a large portion of Ruby's versatility and power.
Lesson 6: Functional Programming
By learning to define functions, you can apply them in various contexts. Then, in Lesson 6, you take your programming to the next step by learning the fundamentals that are essential to functional programming. which is a type of programming that focuses on the use of functions. This is a difficult course, and you might require at least a few times to get everything in your head however the benefits are incredibly rich. The focus is on the trinity of functions that are commonly utilized in functional programming, which includes map-reduce, select, and map. The first example uses the mapping function that lets you map a function to various elements. It's usually a great option to avoid looping. The other function we will cover is select, which allows users to select their data using specific boolean criteria. For instance, you could make an array of numbers and pick only numbers that are divisible evenly by two, providing you with the ability to quickly select only the odd numbers within the array. The third feature is the powerful reduce function, and it is the kind of technique that may require a number of examples to fully take in, but it allows you to write exceptionally precise and clean code. Since reduce, as well as any functional technique, are difficult to grasp even for experts in the field It is particularly effective when paired with test-driven development. This is discussed in Lesson 8.
Lesson 7: Classes and objects
Learn in Lesson 7, you learn how to build your very personal Ruby objects, which could include attributes that are data and methods that are functions that are attached to them. The method of defining objects using Ruby is by using the class method. This results in an object constructor that is used to construct or create a new object, also known as an instance by using the latest method you saw during Lesson 4. This gives you the foundation necessary to comprehend Ruby's object system, which runs throughout the language. In fact, it's often claimed the entirety of Ruby can be described as an object. In this lesson, you'll discover the exact technical significance of this statement. The lesson begins with an actual instance that shows a word object which can determine whether or whether the phrase is a palindrome. Then, you add a translated phrase object, which overrides the primary palindrome method and replaces a phrase that is translated instead. These examples help you comprehend inheritance and derivative classes which are fundamental concepts in object-oriented programming. The lesson also discusses the powerful and even risky practice of altering the native Ruby objects. This lets us modify the class itself and gives every string the ability to identify whether or not it's a palindrome. In the end, we are introduced to Ruby modules, sometimes referred to as mixins. Ruby modules offer us an opportunity to consider the most common functions and mix it into various classes. This is an excellent method to prevent duplicates or reused of codes.
8. The importance of testing and test-driven development
While it is not often covered in introductory programming courses Automated testing is among of the most crucial topics in the modern world of software development. In this regard, Lesson 8 gives you an introduction to testing in Ruby and also a brief look at test-driven development also known as TDD. TDD was mentioned briefly during Lesson 6, where we said that we would employ techniques for testing to bring the ability to find palindromes. This includes being able to recognize complex palindromes like "A man a plan a canal--Panama!" or "Madam, I'm Adam". This lesson will fulfill the promise. Start by setting up your testing system with the minutest toolkit. The method to test the palindrome code, and then expand it to more complex phrases is the following. First, create your test automation system. Two, create automated tests to test the palindrome's existing functionality. Third, create a failed test for the improved palindrome detector referred to as red. This is the initial stage of the TDD cycle, also known as red and green. Refactor. Four, write potentially ugly code to ensure the test passed which is also called green, which is the third step of red green, red Refactor. Five, modify the code by altering its appearance but not changing its purpose. Because the code is expected to produce identical results throughout the time of testing, the test suite must remain green after refactoring. This will complete the red-green, refactoring cycle. It turns out that writing Ruby tests also provides you with the opportunity to master how to design and implement self-contained software applications, referred to as Ruby gems, a crucial ability for those who want to continue Ruby programming.
Lesson 9: ShellScripts
Lesson 10: A Live Web Application
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