Version 3.18.1

APIs

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Object Class

Module: yui-base
Parent Module: yui

Adds utilities to the YUI instance for working with objects.

Item Index

Methods

Properties

Methods

()

(
  • obj
)
Object static

Returns a new object that uses obj as its prototype. This method wraps the native ES5 Object.create() method if available, but doesn't currently pass through Object.create()'s second argument (properties) in order to ensure compatibility with older browsers.

Parameters:

  • obj Object

    Prototype object.

Returns:

Object :

New object using obj as its prototype.

each

(
  • obj
  • fn
  • [thisObj]
  • [proto=false]
)
YUI static chainable

Executes a function on each enumerable property in obj. The function receives the value, the key, and the object itself as parameters (in that order).

By default, only properties owned by obj are enumerated. To include prototype properties, set the proto parameter to true.

Parameters:

  • obj Object

    Object to enumerate.

  • fn Function

    Function to execute on each enumerable property.

    • value Mixed

      Value of the current property.

    • key String

      Key of the current property.

    • obj Object

      Object being enumerated.

  • [thisObj] Object optional

    this object to use when calling fn.

  • [proto=false] Boolean optional

    Include prototype properties.

Returns:

YUI :

the YUI instance.

getValue

(
  • o
  • path
)
Any static

Retrieves the sub value at the provided path, from the value object provided.

Parameters:

  • o Object

    The object from which to extract the property value.

  • path Array

    A path array, specifying the object traversal path from which to obtain the sub value.

Returns:

Any:

The value stored in the path, undefined if not found, undefined if the source is not an object. Returns the source object if an empty path is provided.

hasKey

(
  • obj
  • key
)
Boolean static

Alias for owns().

Parameters:

  • obj Object

    Object to test.

  • key String

    Property name to look for.

Returns:

Boolean :

true if key exists on obj, false otherwise.

hasValue

(
  • obj
  • value
)
Boolean static

Returns true if the object owns an enumerable property with the specified value.

Parameters:

  • obj Object

    An object.

  • value Any

    The value to search for.

Returns:

Boolean :

true if obj contains value, false otherwise.

isEmpty

(
  • obj
)
Boolean static

Defined in yui/js/yui-object.js:369

Available since 3.2.0

Returns true if the object has no enumerable properties of its own.

Parameters:

Returns:

Boolean :

true if the object is empty.

keys

(
  • obj
)
String[] static

Returns an array containing the object's enumerable keys. Does not include prototype keys or non-enumerable keys.

Note that keys are returned in enumeration order (that is, in the same order that they would be enumerated by a for-in loop), which may not be the same as the order in which they were defined.

This method is an alias for the native ES5 Object.keys() method if available and non-buggy. The Opera 11.50 and Android 2.3.x versions of Object.keys() have an inconsistency as they consider prototype to be enumerable, so a non-native shim is used to rectify the difference.

Parameters:

Returns:

String[] :

Array of keys.

Example:

Y.Object.keys({a: 'foo', b: 'bar', c: 'baz'});
 // => ['a', 'b', 'c']

owns

(
  • obj
  • key
)
Boolean static

Returns true if key exists on obj, false if key doesn't exist or exists only on obj's prototype. This is essentially a safer version of obj.hasOwnProperty().

Parameters:

  • obj Object

    Object to test.

  • key String

    Property name to look for.

Returns:

Boolean :

true if key exists on obj, false otherwise.

setValue

(
  • o
  • path
  • val
)
Object static

Sets the sub-attribute value at the provided path on the value object. Returns the modified value object, or undefined if the path is invalid.

Parameters:

  • o Object

    The object on which to set the sub value.

  • path Array

    A path array, specifying the object traversal path at which to set the sub value.

  • val Any

    The new value for the sub-attribute.

Returns:

Object :

The modified object, with the new sub value set, or undefined, if the path was invalid.

size

(
  • obj
)
Number static

Returns the number of enumerable keys owned by an object.

Parameters:

Returns:

Number :

The object's size.

some

(
  • obj
  • fn
  • [thisObj]
  • [proto=false]
)
Boolean static

Executes a function on each enumerable property in obj, but halts if the function returns a truthy value. The function receives the value, the key, and the object itself as paramters (in that order).

By default, only properties owned by obj are enumerated. To include prototype properties, set the proto parameter to true.

Parameters:

  • obj Object

    Object to enumerate.

  • fn Function

    Function to execute on each enumerable property.

    • value Mixed

      Value of the current property.

    • key String

      Key of the current property.

    • obj Object

      Object being enumerated.

  • [thisObj] Object optional

    this object to use when calling fn.

  • [proto=false] Boolean optional

    Include prototype properties.

Returns:

Boolean :

true if any execution of fn returns a truthy value, false otherwise.

values

(
  • obj
)
Array static

Returns an array containing the values of the object's enumerable keys.

Note that values are returned in enumeration order (that is, in the same order that they would be enumerated by a for-in loop), which may not be the same as the order in which they were defined.

Parameters:

Returns:

Array :

Array of values.

Example:

Y.Object.values({a: 'foo', b: 'bar', c: 'baz'});
 // => ['foo', 'bar', 'baz']

Properties

_forceEnum

String[] protected static

Property names that IE doesn't enumerate in for..in loops, even when they should be enumerable. When _hasEnumBug is true, it's necessary to manually enumerate these properties.

_hasEnumBug

Boolean protected static

true if this browser has the JScript enumeration bug that prevents enumeration of the properties named in the _forceEnum array, false otherwise.

See:

_hasProtoEnumBug

Boolean protected static

true if this browser incorrectly considers the prototype property of functions to be enumerable. Currently known to affect Opera 11.50 and Android 2.3.x.

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