By Malay Mandal
Clear up your Ruby programming difficulties that ensue in the course of your daily scripting paintings. This e-book encompasses a assorted choice of sensible and engaging code recipes designed to make your coding existence more straightforward. Ruby Recipes comprises options to difficulties in operating with facts, dealing with exceptions, writing blocks, and utilizing ordinary expressions. This e-book presents prepared scripts for either easy complicated scripting projects, which you could use without problems or with merely minor adjustments. those scripts conceal parts corresponding to collections, periods and constructions, practical programming, and log dealing with. With those convenient recipes at your fingertips, it is possible for you to to unravel these niggling difficulties and turn into much more effective. What you'll research set up and run Ruby learn and write information Write capabilities paintings with arrays, levels, hashes, and iterators deal with dates and time strategy XML as textual content grasp OOP thoughts akin to sessions, items, subclassing, and inheritance hook up with databases Who This booklet Is For Programmers new to Ruby, and net builders attracted to understanding the principles of the language.
Read Online or Download Ruby Recipes A Problem-Solution Approach PDF
Similar object-oriented software design books
During this ebook, the writer Kristian Kersting has made an attack on one of many toughest integration difficulties on the middle of man-made Intelligence examine. This consists of taking 3 disparate significant components of analysis and trying a fusion between them. the 3 components are: good judgment Programming, Uncertainty Reasoning and laptop studying.
(Pearson schooling) textual content combining the rules of object-oriented programming with the facility of layout styles to create a brand new atmosphere for software program improvement. Stresses the significance of research and layout, displaying how styles can facilitate that technique. Softcover. DLC: Object-oriented tools (Computer science).
JDBC: functional advisor for Java Programmers is the fastest option to achieve the talents required for connecting your Java software to a SQL database. functional, tutorial-based insurance retains you centered at the crucial initiatives and strategies, and incisive factors cement your knowing of the API gains you are going to use repeatedly.
Visible languages are the defining section of interactive computing environments, but despite the fast velocity of evolution of this area, major demanding situations stay. visible Languages for Interactive Computing: Definitions and Formalizations provides complete assurance of the issues and methodologies regarding the syntax, semantics, and ambiguities of visible languages.
- Tree-based Graph Partitioning Constraint
- Domain-Specific Modeling
- Murach's Java SE 6
- Applied Microsoft .NET Framework Programming
- A Practical Guide to SysML. The Systems Modeling Language
Extra resources for Ruby Recipes A Problem-Solution Approach
There are other modes possible, however (such as a for append mode, and r+ for “read and”—as in “read and write”). One of the valid modes can be chosen based on the use case. (However, at this point, let’s make do with the w mode). The puts function has been called on the output file handler to output the value of the myword variable. puts myword) does the writing. The last line closes the file. If you run the code repeatedly, you will find that the file is getting overwritten (the modification timestamp should update).
The function itself evaluates to that value). Hence, the value of the statement a = 2 + 3 + 5 is 10, which is the value posted to the a variable after the expression evaluation. So the a variable and the assignment as a whole both evaluate to 10 in this case. Second, the gets function (used on the infile object) returns nil if it fails to read a line. nil in Ruby is equivalent to null (as in Java). And nil is treated as false in a Boolean context (for instance, if you assign nil to a condition that expects a Boolean, the nil will be taken as false).
Gsub('l','x') scan scan has multiple forms. The general (non-block) form returns an array by dividing the string into tokens of the given pattern. It is best understood in the context of regular expressions (discussed in detail in Chapter 7). However, it is a very important string function and hence mentioned here. Suppose the pattern /[a-z]+/ means one or more contiguous characters that are anything from a to z. Take a look at the following as an example. scan(/[a-z]+/) => ["hello", "world"] It scans in the string for any such pattern (contiguous a–z).