By Günther Färber, Julia Kirchner

If youd wish to the best way to software your first executable ABAP functions, then this booklet is your excellent significant other. even if youre already accustomed to one other programming language, youll take advantage of effortless motives and step by step guideline to successfully grasp the fundamentals of programming business-critical functions with ABAP.
Comprehensive, easy-to-follow descriptions introduce you to every of the appropriate strategies and an ongoing useful situation that maintains in the course of the booklet guarantees that you simply make yourself familiar with all significant parts of ABAP improvement. a number of step by step systems, screenshots, and answer counsel are hired by means of the authors to explain procedural and object-oriented language parts in a transparent and easy-to-understand method. In every one bankruptcy, youll additional expand the pattern software, permitting you to construct the talents had to simply reproduce the advance of a complete ABAP software - together with all of its complex information.

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In the code examples that follow, we’re often going to show the value of expressions such as a[0] in a comment at the end of the line. If you simply typed this fragment of code into a file and executed it using Ruby, you’d see no output—you’d need to add something like a call to puts to have the values written to the console. report erratum • discuss Chapter 4. Containers, Blocks, and Iterators • 46 Arrays are indexed using the [ ] operator. As with most Ruby operators, this is actually a method (an instance method of class Array) and hence can be overridden in subclasses.

However, regular expression support is typically built into only scripting languages, such as Ruby, Perl, and awk. This is a shame, because regular expressions, although cryptic, are a powerful tool for working with text. And having them built in, rather than tacked on through a library interface, makes a big difference. Entire books have been written about regular expressions (for example, Mastering Regular Expressions [Fri97]), so we won’t try to cover everything in this short section. Instead, we’ll look at just a few examples of regular expressions in action.

Java, C, and Perl programmers may well get caught by the lack of braces around the bodies of these statements. saturday? sunday? weight num_pallets += 1 end Most statements in Ruby return a value, which means you can use them as conditions. For example, the kernel method gets returns the next line from the standard input stream or nil when the end of the file is reached. downcase end Here, the assignment statement sets the variable line to either the next line of text or nil, and then the while statement tests the value of the assignment, terminating the loop when it is nil.

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