c# barcode generator library free my_string = "It's a #{"bad " * 5}world" puts my_string in Font

Creation Data Matrix 2d barcode in Font my_string = "It's a #{"bad " * 5}world" puts my_string

my_string = "It's a #{"bad " * 5}world" puts my_string
Printing ECC200 In None
Using Barcode encoder for Font Control to generate, create DataMatrix image in Font applications.
www.OnBarcode.com
Make Code-39 In None
Using Barcode printer for Font Control to generate, create Code 3/9 image in Font applications.
www.OnBarcode.com
It's a bad bad bad bad bad world
Data Matrix ECC200 Generation In None
Using Barcode generator for Font Control to generate, create Data Matrix 2d barcode image in Font applications.
www.OnBarcode.com
Making PDF 417 In None
Using Barcode creation for Font Control to generate, create PDF417 image in Font applications.
www.OnBarcode.com
It s worth noting that you could achieve the same results as the preceding results by placing the expressions outside the strings, without using interpolation. For example:
Making Quick Response Code In None
Using Barcode generation for Font Control to generate, create Denso QR Bar Code image in Font applications.
www.OnBarcode.com
Painting Barcode In None
Using Barcode printer for Font Control to generate, create Barcode image in Font applications.
www.OnBarcode.com
x = 10 y = 20 puts x.to_s + " + " + y.to_s + " = " + (x + y).to_s puts "#{x} + #{y} = #{x + y}"
Encode Barcode In None
Using Barcode maker for Font Control to generate, create Barcode image in Font applications.
www.OnBarcode.com
Encoding Code-27 In None
Using Barcode generation for Font Control to generate, create USS Codabar image in Font applications.
www.OnBarcode.com
The two puts lines result in the same output. The first uses string concatenation (+) to join several different strings together. The numbers in x and y are converted to strings with their to_s method. However, the second puts line uses interpolation, which doesn t require the numbers to be converted to strings explicitly.
Data Matrix 2d Barcode Maker In None
Using Barcode generation for Excel Control to generate, create Data Matrix 2d barcode image in Excel applications.
www.OnBarcode.com
Recognize ECC200 In None
Using Barcode scanner for Software Control to read, scan read, scan image in Software applications.
www.OnBarcode.com
String Methods
Code 128C Printer In Java
Using Barcode creation for Java Control to generate, create Code 128 image in Java applications.
www.OnBarcode.com
Barcode Encoder In None
Using Barcode printer for Software Control to generate, create Barcode image in Software applications.
www.OnBarcode.com
We ve looked at using strings in expressions, but you can do a lot more with strings than adding them together or multiplying them. As you experimented in 2, you can use a number of different methods on a string. Table 3-3 provides a recap of the string methods you looked at in 2.
Create Code 39 Full ASCII In None
Using Barcode encoder for Software Control to generate, create Code 39 Full ASCII image in Software applications.
www.OnBarcode.com
USS Code 128 Encoder In Java
Using Barcode creation for BIRT reports Control to generate, create Code 128C image in BIRT reports applications.
www.OnBarcode.com
CHAPTER 3 RUBY S BUILDING BLOCKS: DATA, EXPRESSIONS, AND FLOW CONTROL
Barcode Recognizer In VB.NET
Using Barcode scanner for .NET framework Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
Make QR In Objective-C
Using Barcode generator for iPad Control to generate, create QR Code image in iPad applications.
www.OnBarcode.com
Table 3-3. The Results of Using Different Methods on the String "Test" Expression
GS1-128 Creator In None
Using Barcode maker for Software Control to generate, create EAN 128 image in Software applications.
www.OnBarcode.com
PDF-417 2d Barcode Scanner In Visual C#.NET
Using Barcode scanner for Visual Studio .NET Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
"Test" + "Test" "Test".capitalize "Test".downcase "Test".chop "Test".hash "Test".next "Test".reverse "Test".sum "Test".swapcase "Test".upcase "Test".upcase.reverse "Test".upcase.reverse.next
Denso QR Bar Code Creator In None
Using Barcode drawer for Microsoft Word Control to generate, create Denso QR Bar Code image in Office Word applications.
www.OnBarcode.com
Generate Barcode In None
Using Barcode creator for Software Control to generate, create Barcode image in Software applications.
www.OnBarcode.com
Output
TestTest Test test Tes -98625764 Tesu tseT 416 tEST TEST TSET TSEU
In each example in Table 3-3, you re using a method that the string offers, whether it s concatenation, conversion to upper case, reversal, or merely incrementing the last letter. You can chain methods together, as in the final example of the table. First, you create the "Test" string literal, then you convert it to upper case, returning TEST, then you reverse that, returning TSET, and then you increment the last letter of that, returning TSEU. Another method you used in 2 was length, like so:
puts "This is a test".length
These methods are useful, but they don t let you do anything particularly impressive with your strings. Let s move on to playing directly with the text itself.
Regular Expressions and String Manipulation
When working with strings at an advanced level, it becomes necessary to learn about regular expressions. A regular expression is, essentially, a search query, and not to be confused with the expressions we ve discussed already in this chapter. If you type ruby into your favorite search engine, you d expect information about Ruby to appear. Likewise, if your regular expression is ruby and you run that query against, say, a long string, you d
CHAPTER 3 RUBY S BUILDING BLOCKS: DATA, EXPRESSIONS, AND FLOW CONTROL
expect any matches to be returned. A regular expression, therefore, is a string that describes a pattern for matching elements in other strings.
Note This section provides only a brief introduction to regular expressions. Regular expressions are a
major branch of computer science, and many books and Web sites are dedicated to their use. Ruby supports the majority of standard regular expression syntax, so non Ruby-specific knowledge about regular expressions obtained from elsewhere can still prove useful in Ruby.
Substitutions
One thing you ll often want to do is substitute something within a string for something else. Take this example:
puts "foobar".sub('bar', 'foo')
foofoo
In this example you use a method on the string called sub, which substitutes the first instance of the first parameter 'bar' with the second parameter 'foo', resulting in foofoo. sub only does one substitution at a time, on the first instance of the text to match, whereas gsub does multiple substitutions at once, as this example demonstrates:
puts "this is a test".gsub('i', '')
ths s a test
Here you ve substituted all occurrences of the letter 'i' with an empty string. What about more complex patterns Simply matching the letter 'i' is not a true example of a regular expression. For example, let s say you want to replace the first two characters of a string with 'Hello':
x = "This is a test" puts x.sub(/^../, 'Hello')
CHAPTER 3 RUBY S BUILDING BLOCKS: DATA, EXPRESSIONS, AND FLOW CONTROL
Hellois is a test
In this case, you make a single substitution with sub. The first parameter given to sub isn t a string but a regular expression forward slashes are used to start and end a regular expression. Within the regular expression is ^... The ^ is an anchor, meaning the regular expression will match from the beginning of any lines within the string. The two periods each represent any character. In all, /^../ means any two characters immediately after the start of a line. Therefore, Th of "This is a test" gets replaced with Hello. Likewise, if you want to change the last two letters, you can use a different anchor:
x = "This is a test" puts x.sub(/..$/, 'Hello')
Copyright © OnBarcode.com . All rights reserved.