Global Variables

A set of (core) variables designed to save typing and time, period.

Variable(s)	Equivalent To
w, h	`display.contentWidth`, `display.contentHeight`
centerX, centerY	`display.actualContentWidth`, `display.actualContentWidth`
fullw, fullh	`display.actualContentWidth`, `display.actualContentWidth`
unusedWidth, unusedHeight	`fullw - w` and `fullh - h` respetively.
left, right, top, bottom	Calculated positions for the true edges of the screen, regardless of scaling used.

Global Functions

A set of (core) functions designed to save time writing common code.

The following functions improve on the Runtime:* event functions.

Syntax	Summary
listen( name, listener )	Shorthand equivalent to `Runtime:addEventListner( event, listener )`
ignore( name, listener )	Shorthand equivalent to `Runtime:removeEventListner( event, listener )`
ignoreList( list, obj )	Removes all listeners in table `list` if found on `obj`.
post( name, [ params [, debuglvl ]] )	Dispatches `name` event with optional `params` table.
autoIgnore( name, obj )	Stop listening for `name` event if `obj` is invalid.

A (small) set of utility functions that I use very frequently.

Syntax	Summary
fnn( ... )	Return first argument from list that is not nil.
round( val [ , n ])	Rounds a number to the nearest decimal place.
nextFrame( func )	Execute func in new frame. (Credit: Sergey Lerg)