Yahoo! UI Library

YAHOO Global  2.3.0

Yahoo! UI Library > yahoo > YAHOO.lang

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Class YAHOO.lang

Provides the language utilites and extensions used by the library

Properties

_IEEnumFix - private static object

IE will not enumerate native functions in a derived object even if the function was overridden. This is a workaround for specific functions we care about on the Object prototype.

Methods

augment

static void augment ( r , s , arguments )
Same as YAHOO.lang.augmentObject, except it only applies prototype properties. This is an alias for augmentProto.
Parameters:
r <Function> the object to receive the augmentation
s <Function> the object that supplies the properties to augment
arguments <String*|boolean> zero or more properties methods to augment the receiver with. If none specified, everything in the supplier will be used unless it would overwrite an existing property in the receiver. if true is specified as the third parameter, all properties will be applied and will overwrite an existing property in the receiver
Returns: void

augmentObject

static void augmentObject ( r , s , arguments )
Applies all properties in the supplier to the receiver if the receiver does not have these properties yet. Optionally, one or more methods/properties can be specified (as additional parameters). This option will overwrite the property if receiver has it already. If true is passed as the third parameter, all properties will be applied and _will_ overwrite properties in the receiver.
Parameters:
r <Function> the object to receive the augmentation
s <Function> the object that supplies the properties to augment
arguments <String*|boolean> zero or more properties methods to augment the receiver with. If none specified, everything in the supplier will be used unless it would overwrite an existing property in the receiver. If true is specified as the third parameter, all properties will be applied and will overwrite an existing property in the receiver
Returns: void

augmentProto

static void augmentProto ( r , s , arguments )
Same as YAHOO.lang.augmentObject, except it only applies prototype properties
Parameters:
r <Function> the object to receive the augmentation
s <Function> the object that supplies the properties to augment
arguments <String*|boolean> zero or more properties methods to augment the receiver with. If none specified, everything in the supplier will be used unless it would overwrite an existing property in the receiver. if true is specified as the third parameter, all properties will be applied and will overwrite an existing property in the receiver
Returns: void

dump

String dump ( o , d )
Returns a simple string representation of the object or array. Other types of objects will be returned unprocessed. Arrays are expected to be indexed. Use object notation for associative arrays.
Parameters:
o <Object> The object to dump
d <int> How deep to recurse child objects, default 3
Returns: String
the dump result

extend

static void extend ( subc , superc , overrides )
Utility to set up the prototype, constructor and superclass properties to support an inheritance strategy that can chain constructors and methods. Static members will not be inherited.
Parameters:
subc <Function> the object to modify
superc <Function> the object to inherit
overrides <Object> additional properties/methods to add to the subclass prototype. These will override the matching items obtained from the superclass if present.
Returns: void

hasOwnProperty

void hasOwnProperty ( o )
Determines whether or not the property was added to the object instance. Returns false if the property is not present in the object, or was inherited from the prototype. This abstraction is provided to enable hasOwnProperty for Safari 1.3.x. There is a discrepancy between YAHOO.lang.hasOwnProperty and Object.prototype.hasOwnProperty when the property is a primitive added to both the instance AND prototype with the same value: 
var A = function() {};
A.prototype.foo = 'foo';
var a = new A();
a.foo = 'foo';
alert(a.hasOwnProperty('foo')); // true
alert(YAHOO.lang.hasOwnProperty(a, 'foo')); // false when using fallback
Parameters:
o <any> The object being testing
Returns: void
Boolean

isArray

void isArray ( o )
Determines whether or not the provided object is an array. Testing typeof/instanceof/constructor of arrays across frame boundaries isn't possible in Safari unless you have a reference to the other frame to test against its Array prototype. To handle this case, we test well-known array properties instead. properties.
Parameters:
o <any> The object being testing
Returns: void
Boolean

isBoolean

void isBoolean ( o )
Determines whether or not the provided object is a boolean
Parameters:
o <any> The object being testing
Returns: void
Boolean

isFunction

void isFunction ( o )
Determines whether or not the provided object is a function
Parameters:
o <any> The object being testing
Returns: void
Boolean

isNull

void isNull ( o )
Determines whether or not the provided object is null
Parameters:
o <any> The object being testing
Returns: void
Boolean

isNumber

void isNumber ( o )
Determines whether or not the provided object is a legal number
Parameters:
o <any> The object being testing
Returns: void
Boolean

isObject

void isObject ( o )
Determines whether or not the provided object is of type object or function
Parameters:
o <any> The object being testing
Returns: void
Boolean

isString

void isString ( o )
Determines whether or not the provided object is a string
Parameters:
o <any> The object being testing
Returns: void
Boolean

isUndefined

void isUndefined ( o )
Determines whether or not the provided object is undefined
Parameters:
o <any> The object being testing
Returns: void
Boolean

isValue

boolean isValue ( o )
A convenience method for detecting a legitimate non-null value. Returns false for null/undefined/NaN, true for other values, including 0/false/''
Parameters:
o <any> the item to test
Returns: boolean
true if it is not null/undefined/NaN || false

merge

void merge ( arguments )
Returns a new object containing all of the properties of all the supplied objects. The properties from later objects will overwrite those in earlier objects.
Parameters:
arguments <Object*> the objects to merge
Returns: void
the new merged object

substitute

String substitute ( s , o , f )
Does variable substitution on a string. It scans through the string looking for expressions enclosed in { } braces. If an expression is found, it is used a key on the object. If there is a space in the key, the first word is used for the key and the rest is provided to an optional function to be used to programatically determine the value (the extra information might be used for this decision). If the value for the key in the object, or what is returned from the function has a string value, number value, or object value, it is substituted for the bracket expression and it repeats. If this value is an object, it uses the Object's toString() if this has been overridden, otherwise it does a shallow dump of the key/value pairs.
Parameters:
s <String> The string that will be modified.
o <Object> An object containing the replacement values
f <Function> An optional function that can be used to process each match. It receives the key, value, and any extra metadata included with the key inside of the braces.
Returns: String
the substituted string

trim

string trim ( s )
Returns a string without any leading or trailing whitespace. If the input is not a string, the input will be returned untouched.
Parameters:
s <string> the string to trim
Returns: string
the trimmed string

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