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Upgrade from 1.2 to 1.3

 
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This is a list of the API changes made from 1.2 to 1.3. It allows you to drop the compatibility layer mostly by doing search and replace. If you just want to update to MooTools Core 1.3 with your existing code, see Update from 1.2 to 1.3.

Core
$chk(value) => (value != null)
$A(item) => Array.from(item) // Note: Array.from does not always return a new array but just ensures that the return value is an array.
$splat => Array.from
$clear => use the native clearTimeout when using fn.delay, use clearInterval when using fn.periodical.
$defined => (value != null)
$each => use Array.each for arrays, Object.each for objects
$empty => No replacement, use function(){}
$extend(source, extended) => Object.append(source, extended)
$merge(a, b) => Object.merge({}, a, b)
$mixin(a, b) => Object.merge(a, b)
$lambda => Function.from
$random => Number.random
$time => Date.now
$type => typeOf // Note: returns a string 'null' on empty objects as opposed to "false" in 1.2
$unlink => Array.clone or Object.clone
$arguments => No replacement
Native => Type (see Core.js)
Array.type / String.type / Number.type / … => Type.isArray / Type.isString / Type.isNumber / …
Hash and $H were deprecated and moved from Core to More. Use plain objects instead of Hash. You can find methods to manipulate objects on Object. You can find all 1.2 functionality of Hash in MooTools More 1.3.
Browser
Engine detection was changed in favor of user-agent detection. Browser.Engine was deprecated and according properties on the Browser object were added:

Browser.Engine.trident => Browser.ie
Browser.Engine.gecko => Browser.firefox
Browser.Engine.webkit => Browser.safari or Browser.chrome
Browser.Engine.presto => Browser.opera
Browser.Platform.ipod => Browser.Platform.ios
$exec => Browser.exec
Array
$pick => Array.pick or [a, b, c].pick()
Array.extend => Array.append
Function
$try => Function.attempt
myFn.run(args, bind) => myFn.apply(bind, Array.from(args));
myFn.create => Use the according functions like .pass, .bind, .delay, .periodical
myFn.bindWithEvent => deprecated
myFn.bind(this, [arg1, arg2, arg3]) => myFn.bind(this, arg1, arg2, arg3) OR myFn.pass([arg1, arg2, arg3], this)
Element
element.injectInside, .injectBefore, .injectAfter, .injectBottom, .injectTop => element.inject(context, where); // where = inside, bottom, …
element.grabTop, … => element.grab(context, where) // see above
element.hasChild(item) => item !== element && element.contains(item)
$$ now only accepts a single selector, an array or arguments of elements
Selectors.Pseudo => Slick.definePseudo(name, fn)
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