Tutorial by Topics

CanCan is a simple authorization strategy for Rails which is decoupled from user roles. All permissions are stored in a single location. Before using CanCan don't forget to create Users either by devise gem or manually. To get maximum functionality of CanCan do create an Admin user.

UIImagePickerController provides an almost out of the box solution to allow the user to select an image from their device or take a picture with the camera and then present that image. By conforming to the UIImagePickerControllerDelegate, you can create logic that specifies in your app how to presen...

(read-char &optional stream eof-error-p eof-value recursive-p) => character (write-char character &optional stream) => character (read-line &optional stream eof-error-p eof-value recursive-p) => line, missing-newline-p (write-line line &optional stream) => line ...

Tcl is a cross platform language with full unicode support. Flexibility: redefine or enhance existing commands or write new commands. Event driven programming: Event driven I/O and variable tracing. Library Interface: It is very easy to integrate existing C libraries into Tcl and provide a Tcl ...

git show [options] <object>... Shows various Git objects. For commits, shows the commit message and diff For tags, shows the tag message and referenced object

Swift has an official style guide: Swift.org API Design Guidelines. Another popular guide is The Official raywenderlich.com Swift Style Guide.

<text>DetailsxThe x position of the text.yThe y position of the text.dxRelative shift in x position.dyRelative shift in y position.rotateSpecifies the angular displacement for text glyphs.textLengthFits the text into the given length.lengthAdjustSpecifies whether just kerning or kerning &...

AttributeDescriptionx1Horizontal position of start of line.y1Vertical position of start of line.x2Horizontal position of end of line.y2Vertical position of end of line.strokeColor of line.stroke-widthWidth of line.stroke-opacityOpacity of line.stroke-dasharrayDash pattern for the linestroke-linecap...

Big thanks to Pete Freitag for his CFScript Cheat Sheet Adam Cameron for CF 11: CFLOOP in CFScript is Very Broken (and it still is in CF 2016).

[ localpart "@" ] domainpart [ "/" resourcepart ] PartCommon UsageLocalpartIdentifies an XMPP entity (optional)DomainpartIdentifies the XMPP serviceResourcepartIdentifies a session of an XMPP entity (optional) XMPP addresses, more commonly known as JIDs (Jabber Identif...

XMPP allows for the full-duplex exchange of structured data and concurrent processing of requests between globally addressable clients and servers on the network. Unlike HTTP and the "Representational State Transfer" (REST) architecture widely deployed on the web, XMPP connections are st...

Multi-Dimensional eXpressions MDX is a declarative language. A developer will use it to query multi-dimensional data structures known as OLAP Cubes. It is also used within the cubes to create aspects of the cubes.

column-count: auto|number|inherit|initial|unset; column-width: auto|length; column: [column-width]|[column-count]; column-span: none|all|inherit|initial|unset; column-gap: normal|length|inherit|initial|unset; column-fill: auto|balance|inherit|intial|unset; column-rule-color: color|inherit|in...