ERXArrayUtilities.MedianOperator Class Reference

List of all members.

Public Member Functions
Object	compute (NSArray<?> array, String keypath)
	MedianOperator ()

---

Detailed Description

Define an NSArray.Operator for the key median.

This allows for key value paths like:

• myArray.valueForKey("@median.payment.amount");
• myArray.valueForKey("payment.@median.amount");
• myArray.valueForKey("payment.amount.@median");

which return the median of the array elements at the given key path. The median is the value for which half of the elements are above and half the elements are below. As such, an array sort is needed and this might be very costly depending of the size of the array.

The operator applies to the array of objects to its left if it is the last key in the path. Otherwise it applies to the end of the keypath to its right. It should not be followed by an array or any other array operators. This is because it does not call valueForKeyPath on the array to its left, but instead loops through the values of the array to its left, calling valueForKeyPath on the individual array values instead. This behavior is consistent with Apple's standard NSArray operators.

---

Constructor & Destructor Documentation

MedianOperator

(

)

public empty constructor

---

Member Function Documentation

Object compute	(	NSArray<?>	array,
		String	keypath
	)

returns the median value for the values of the keypath.

Parameters:

	array	array to be checked.
	keypath	path to numeric values

Returns:

median value

---

The documentation for this class was generated from the following file:

• /opt/source/Wonder/Frameworks/Core/ERExtensions/Sources/er/extensions/foundation/ERXArrayUtilities.java