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2. 3. ssh://[email protected]/tmp/file (HINT: recall that the IANA establishes default port numbers for various network services.) Project 2.5. As described on the DuckDuckGo Search API documentation , you can do query the DuckDuckGo search engine for a term by constructing a URI that includes the search query as a parameter named q , for example, to search for the term “saas”. However, as Figure 2.3 showed, some characters are not allowed in URIs because they are “special,” including spaces, ’?’, and ’&’. Given this restriction, construct a legal URI that searches DuckDuckGo for the terms “M&M” and “100%?”. String#ord returns the string’s first codepoint (numeric value corresponding to a character in a character set). If the string is encoded in ASCII , ord returns the first character’s ASCII code. So ”%”.ord shows the ASCII code for % , and ”%”.ord.to_s(16) shows its hexadecimal equivalent. Project 2.6. Why do Rails routes map to controller actions but not model actions or views? Project 2.7. Given a high-level design, identify the software architecture by differentiating among common software architectures such as three-tier, pipe-and-filter, and client-server. Project 2.8. Investigate the impact of software architectures selection on the design of a simple system. Look at alternatives to client-server, alternatives to request-reply, and so on.
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3. SaaS Framework: Introduction to Ruby for Java Programmers Jim Gray (1944–Lost at sea 2007) was a friendly giant in computer science. He was the first PhD in Computer Science from UC Berkeley, and he mentored hundreds of PhD students and faculty around the world. He received the 1998 Turing Award for contributions to database and transaction processing research and technical leadership in system implementation. Well, the <omitted> paper is in good company (and for the same reason). The B-tree paper was rejected at first. The Transaction paper was rejected at first. The data cube paper was rejected at first. The five-minute rule paper was rejected at first. But linear extensions of previous work get accepted. So, resubmit! PLEASE!!! Jim Gray, Email to Jim Larus about a rejected paper, 2000
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3.1 Overview and Three Pillars of Ruby 3.2 Everything is an Object 3.3 Every Operation is a Method Call 3.4 Classes, Methods, and Inheritance 3.5 All Programming is Metaprogramming 3.6 Blocks: Iterators, Functional Idioms, and Closures 3.7 Mix-ins and Duck Typing 3.8 Make Your Own Iterators Using Yield 3.9 Fallacies and Pitfalls 3.10 Concluding Remarks: Idiomatic Language Use 3.11 To Learn More 3.12 Suggested Projects Concepts This chapter introduces both the Ruby equivalents of basic object-oriented techniques in other languages such as Java and some Ruby mechanisms with no Java counterparts that help with reuse and DRYness.
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