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Inline SVG

SVG can be written directly into a HTML document. Inline SVG can be styled and manipulated using CSS and JavaScript. <body> <svg class="attention" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 1000 1000&qu...

HTML • SVG

Embedding SVG using CSS

You can add external SVG files using the background-image property, just as you would do with any other image. HTML: <div class="attention"></div> CSS: .attention { background-image: url(attention.svg); background-size: 100% 100%; width: 50px; height: ...

HTML • SVG

Splitting

You can split a string into an array of parts, divided by a separator character. NSString * yourString = @"Stack,Exchange,Network"; NSArray * yourWords = [yourString componentsSeparatedByString:@","]; // Output: @[@"Stack", @"Exchange", @"Network&quot...

Objective-C Language • NSString

Searching for a Substring

To search if a String contains a substring, do the following: NSString *myString = @"This is for checking substrings"; NSString *subString = @"checking"; BOOL doesContainSubstring = [myString containsString:subString]; // YES If targeting iOS 7 or OS X 10.9 (or earlier)...

Objective-C Language • NSString

Work with Arrays, Not With Ranges

Office Blog - Excel VBA Performance Coding Best Practices Often, best performance is achieved by avoiding the use of Range as much as possible. In this example we read in an entire Range object into an array, square each number in the array, and then return the array back to the Range. This accesse...

excel-vba • VBA Best Practices

Block Typedefs

typedef double (^Operation)(double first, double second); If you declare a block type as a typedef, you can then use the new type name instead of the full description of the arguments and return values. This defines Operation as a block that takes two doubles and returns a double. The type can b...

Objective-C Language • Blocks

Variable Names

Variables hold data. Name them after what they're used for, not after their data type or scope, using a noun. If you feel compelled to number your variables (e.g. thing1, thing2, thing3), then consider using an appropriate data structure instead (e.g. an array, a Collection, or a Dictionary). Names...

VBA • Naming Conventions

Procedure Names

Procedures do something. Name them after what they're doing, using a verb. If accurately naming a procedure is not possible, likely the procedure is doing too many things and needs to be broken down into smaller, more specialized procedures. Some common VBA naming conventions go thus: For all Pr...

VBA • Naming Conventions

Basic Component

Given the following HTML file: index.html <!DOCTYPE html> <html> <head> <meta charset="utf-8" /> <title>React Tutorial</title> <script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.2.1/react.js"></script>...

React • Components

Alternative CSS

HTML • Linking Resources

Structs cannot inherit

Unlike classes, structures cannot inherit: class MyView: NSView { } // works struct MyInt: Int { } // error: inheritance from non-protocol type 'Int' Structures, however, can adopt protocols: struct Vector: Hashable { ... } // works

Swift Language • Structs

Extractor Infix notation

If a case class has exactly two values, its extractor can be used in infix notation. case class Pair(a: String, b: String) val p: Pair = Pair("hello", "world") val x Pair y = p //x: String = hello //y: String = world Any extractor that returns a 2-tuple can work this way....

Scala Language • Extractors

For-in loop

The for-in loop allows you to iterate over any sequence. Iterating over a range You can iterate over both half-open and closed ranges: for i in 0..<3 { print(i) } for i in 0...2 { print(i) } // Both print: // 0 // 1 // 2 Iterating over an array or set let names = [&quo...

Swift Language • Loops

Repeat-while loop

Similar to the while loop, only the control statement is evaluated after the loop. Therefore, the loop will always execute at least once. var i: Int = 0 repeat { print(i) i += 1 } while i < 3 // 0 // 1 // 2

Swift Language • Loops

while loop

A while loop will execute as long as the condition is true. var count = 1 while count < 10 { print("This is the \(count) run of the loop") count += 1 }

Swift Language • Loops

Using Range with various Linq methods

You can use the Enumerable class alongside Linq queries to convert for loops into Linq one liners. Select Example Opposed to doing this: var asciiCharacters = new List<char>(); for (var x = 0; x < 256; x++) { asciiCharacters.Add((char)x); } You can do this: var asciiCharacter...

C# Language • LINQ Queries

Remove value from array

When you need to remove a specific value from an array, you can use the following one-liner to create a copy array without the given value: array.filter(function(val) { return val !== to_remove; }); Or if you want to change the array itself without creating a copy (for example if you write a fun...

JavaScript • Arrays

Benefits of Using Composer

Composer tracks which versions of packages you have installed in a file called composer.lock, which is intended to be committed to version control, so that when the project is cloned in the future, simply running composer install will download and install all the project's dependencies. Composer de...

PHP • Composer Dependency Manager

Nesting Components

A lot of the power of ReactJS is its ability to allow nesting of components. Take the following two components: var React = require('react'); var createReactClass = require('create-react-class'); var CommentList = reactCreateClass({ render: function() { return ( <div className...

React • Components

Create

From NSString: NSString *urlString = @"https://www.stackoverflow.com"; NSURL *myUrl = [NSURL URLWithString: urlString]; You can also use the following methods: - initWithString: + URLWithString:relativeToURL: - initWithString:relativeToURL: + fileURLWithPath:isDirectory: - initF...

Objective-C Language • NSURL