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Ruby

From: Foundations of Programming: Fundamentals

Video: Ruby

Let's take a look at one of the newer languages on the list, Ruby. This was developed in Japan in the mid 1990s and most people would consider it a very pure object oriented language. In Ruby everything is an object, even variables that might be considered primitives in other languages like Booleans or integers. Everything is an object. It's a high level garbage collected language. We don't really need to think about memory management and it's completely interpreted. We don't need a compiler for Ruby. We do need an interpreter.

Ruby

Let's take a look at one of the newer languages on the list, Ruby. This was developed in Japan in the mid 1990s and most people would consider it a very pure object oriented language. In Ruby everything is an object, even variables that might be considered primitives in other languages like Booleans or integers. Everything is an object. It's a high level garbage collected language. We don't really need to think about memory management and it's completely interpreted. We don't need a compiler for Ruby. We do need an interpreter.

It doesn't compile to intermediate language like Java or the .NET languages. Most people find it very easy to approach. There isn't a lot of prerequisite knowledge required to get started with Ruby. So it's fairly friendly for beginners. The question is what it used for? Well, it is a cross-platform language. There are installers and interpreters available on every OS and you'll actually find it built into the last few versions of Mac OS X. It's probably become most famous recently for it to use in what's called Ruby on Rails.

This is a web framework that uses the Ruby language. Aside from that it's a great language for writing small utilities, text processing applications on the desktop. So what does it look like? Well, it is not obviously a C based language. We don't need a main section. This would be considered an entire working Ruby program. Puts for put string "Hello, world! No semicolons at the end of the line, but this doesn't really tell us too much about it.

So I'll add a few more lines here. I'm going to define what we call a function here. I can see that we use comments, not with the two forward slashes, but with the pound sign or hash sign. And then creating this function or method here, I'm using the word def for define. We're calling this welcome saying it takes a parameter of name and then we're going to output hello comma, whatever the name is. We don't use curly braces to mark the end of the function. We use the word end instead and then below it I say x = bob.

This is how I'd create a variable which is a string and then I just call this function or method saying welcome and passing in x. Again, don't worry about memorizing syntax. The idea here is that you're just looking at the overall structure. Ruby is a fairly compact, fairly clean language to get started with. And if you're interested, what do you need? Well, not really a lot. If you're working on a Mac you already have the Ruby interpreter there. There are several different editors that you might use. TextMate and RubyMine on the Mac, Aptana is cross-platform.

There're quite a few that have Ruby support. Probably the most two important websites are rubyonrails.org, which is all about that web based framework that uses the Ruby language, and ruby-lang.org. Both of these have fantastic resources for getting started with Ruby, either the Ruby language by itself or as a web based framework.

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This video is part of

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Foundations of Programming: Fundamentals

61 video lessons · 82280 viewers

Simon Allardice
Author

 
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  1. 4m 14s
    1. Welcome
      1m 16s
    2. Making the most of this course
      2m 8s
    3. Using the exercise files
      50s
  2. 22m 11s
    1. What is programming?
      5m 45s
    2. What is a programming language?
      4m 48s
    3. Writing source code
      5m 34s
    4. Compiled and interpreted languages
      6m 4s
  3. 16m 29s
    1. Why JavaScript?
      4m 45s
    2. Creating your first program in JavaScript
      6m 54s
    3. Requesting input
      4m 50s
  4. 31m 38s
    1. Introduction to variables and data types
      5m 16s
    2. Understanding strong, weak, and duck-typed languages
      3m 51s
    3. Working with numbers
      5m 4s
    4. Using characters and strings
      4m 5s
    5. Working with operators
      4m 47s
    6. Properly using white space
      6m 46s
    7. Adding comments to code for human understanding
      1m 49s
  5. 24m 49s
    1. Building with the if statement
      7m 35s
    2. Working with complex conditions
      4m 10s
    3. Setting comparison operators
      6m 59s
    4. Using the switch statement
      6m 5s
  6. 17m 56s
    1. Breaking your code apart
      4m 1s
    2. Creating and calling functions
      2m 57s
    3. Setting parameters and arguments
      6m 7s
    4. Understanding variable scope
      2m 23s
    5. Splitting code into different files
      2m 28s
  7. 13m 32s
    1. Introduction to iteration
      4m 28s
    2. Writing a while statement
      5m 24s
    3. Creating a for loop
      3m 40s
  8. 19m 28s
    1. Cleaning up with string concatenation
      4m 30s
    2. Finding patterns in strings
      8m 3s
    3. Introduction to regular expressions
      6m 55s
  9. 19m 59s
    1. Working with arrays
      5m 47s
    2. Array behavior
      5m 29s
    3. Iterating through collections
      5m 18s
    4. Collections in other languages
      3m 25s
  10. 10m 50s
    1. Programming style
      5m 55s
    2. Writing pseudocode
      4m 55s
  11. 25m 55s
    1. Input/output and persistence
      3m 6s
    2. Reading and writing from the DOM
      8m 11s
    3. Event driven programming
      7m 47s
    4. Introduction to file I/O
      6m 51s
  12. 24m 26s
    1. Introduction to debugging
      5m 57s
    2. Tracing through a section of code
      7m 5s
    3. Understanding error messages
      3m 21s
    4. Using debuggers
      8m 3s
  13. 14m 17s
    1. Introduction to object-oriented languages
      5m 18s
    2. Using classes and objects
      6m 29s
    3. Reviewing object-oriented languages
      2m 30s
  14. 11m 14s
    1. Memory management across languages
      5m 11s
    2. Introduction to algorithms
      4m 2s
    3. Introduction to multithreading
      2m 1s
  15. 29m 20s
    1. Introduction to languages
      1m 42s
    2. C-based languages
      4m 40s
    3. The Java world
      3m 13s
    4. .NET languages: C# and Visual Basic .NET
      6m 17s
    5. Ruby
      3m 4s
    6. Python
      2m 56s
    7. Objective-C
      4m 3s
    8. Libraries and frameworks
      3m 25s
  16. 1m 2s
    1. Where to go from here
      1m 2s

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