Tutorial by Examples | RIP Tutorial

Spanning columns or rows

Table cells can span multiple columns or rows using the colspan and rowspan attributes. These attributes can be applied to <th> and <td> elements. <table> <tr> <td>row 1 col 1</td> <td>row 1 col 2</td> <td>row 1 c...

HTML • Tables

Element Language

The lang attribute is used to specify the language of element content and attribute text values: <p lang="en">The content of this element is in English.</p> <p lang="en" title="The value of this attribute is also in English.">The content of this el...

HTML • Content Languages

Elements with Multiple Languages

You can "overwrite" a language declaration: <p lang="en">This English sentence contains the German word <span lang="de">Hallo</span>.</p>

HTML • Content Languages

Handling Attributes with Different Languages

You can "overwrite" a parent element's language declaration by introducing any element apart from applet, base, basefont, br, frame, frameset, hr, iframe, meta, param, script (of HTML 4.0) with an own lang attribute: <p lang="en" title="An English paragraph"> ...

HTML • Content Languages

Base Document Language

It’s a good practice to declare the primary language of the document in the html element: <html lang="en"> If no other lang attribute is specified in the document, it means that everything (i.e., element content and attribute text values) is in that language. If the document con...

HTML • Content Languages

Section Element

The <section> element represents a generic section to thematically group content. Every section, typically, should be able to be identified with a heading element as a child of the section. You can use the <section> element within an <article> and vice-versa. Every section shou...

HTML • Sectioning Elements

Fixtures

From Wikipedia: A test fixture is something used to consistently test some item, device, or piece of software. It can also enhance readability of tests by extracting common initialisation / finalisation code from the test methods themselves. Where common initialisation can be executed once in...

junit • Tests

params

params allows a method parameter to receive a variable number of arguments, i.e. zero, one or multiple arguments are allowed for that parameter. static int AddAll(params int[] numbers) { int total = 0; foreach (int number in numbers) { total += number; } ret...

C# Language • Keywords

Simple usage

Object initializers are handy when you need to create an object and set a couple of properties right away, but the available constructors are not sufficient. Say you have a class public class Book { public string Title { get; set; } public string Author { get; set; } // the rest o...

C# Language • Object initializers

Usage with anonymous types

Object initializers are the only way to initialize anonymous types, which are types generated by the compiler. var album = new { Band = "Beatles", Title = "Abbey Road" }; For that reason object initializers are widely used in LINQ select queries, since they provide a convenie...

C# Language • Object initializers

Recurse the whole pattern

The construct (?R) is equivalent to (?0) (or \g<0>) - it lets you recurse the whole pattern: <(?>[^<>]+|(?R))+> This will match properly balanced angle brackets with any text in-between the brackets, like <a<b>c<d>e>.

Regular Expressions • Recursion

Recurse into a subpattern

You can recurse into a subpattern using the following constructs (depending on the flavor), assuming n is a capturing group number, and name the name of a capturing group. (?n) \g<n> \g'0' (?&name) \g<name> \g'name' (?P>name) The following pattern: \[(?<angle>&...

Regular Expressions • Recursion

Subpattern definitions

The (?(DEFINE)...) construct lets you define subpatterns you may reference later through recursion. When encountered in the pattern it will not be matched against. This group should contain named subpattern definitions, which will be accessible only through recursion. You can define grammars this w...

Regular Expressions • Recursion

Relative group references

Subpatterns can be referenced with their relative group number: (?-1) will recurse into the previous group (?+1) will recurse into the next group Also usable with the \g<N> syntax.

Regular Expressions • Recursion

Using the Delegate Pattern (passing data back)

To pass data from the current view controller back to the previous view controller, you can use the delegate pattern. This example assumes that you have made a segue in the Interface Builder and that you set the segue identifier to showSecondViewController. The outlets and actions must also be ho...

iOS • Passing Data between View Controllers

Simple method annotation

Documentation comments are placed directly above the method or class they describe. They begin with three forward slashes ///, and allow meta information to be stored via XML. /// <summary> /// Bar method description /// </summary> public void Bar() { } Information in...

C# Language • XML Documentation Comments

Horizontal Rules

You can create a horizontal break to divide your text by placing three (or more) underscores ___ or asterisks *** or hyphens --- on their own line. You can create a horizontal break to divide your text by placing three (or more) underscores or asterisks or hyphens o...

Markdown • Text Formatting

Precompiled patterns

import re precompiled_pattern = re.compile(r"(\d+)") matches = precompiled_pattern.search("The answer is 41!") matches.group(1) # Out: 41 matches = precompiled_pattern.search("Or was it 42?") matches.group(1) # Out: 42 Compiling a pattern allows it to be r...

Python Language • Regular Expressions (Regex)

Infinite sequences

Generators can be used to represent infinite sequences: def integers_starting_from(n): while True: yield n n += 1 natural_numbers = integers_starting_from(1) Infinite sequence of numbers as above can also be generated with the help of itertools.count. The above code cou...

Python Language • Generators

Counting map elements

The built-in function len returns the number of elements in a map m := map[string]int{} len(m) // 0 m["foo"] = 1 len(m) // 1 If a variable points to a nil map, then len returns 0. var m map[string]int len(m) // 0

Go • Maps