featureReduceCallback

Description

Callback for featureReduce

The first time the callback function is called, the values provided as arguments depend on whether the reduce method has an initialValue argument.

If an initialValue is provided to the reduce method:

• The previousValue argument is initialValue.
• The currentValue argument is the value of the first element present in the array.

If an initialValue is not provided:

• The previousValue argument is the value of the first element present in the array.
• The currentValue argument is the value of the second element present in the array.

Definition

function (

Name	Type	Description
previousValue	Reducer	The accumulated value previously returned in the last invocation of the callback, or initialValue, if supplied.
currentFeature	Feature	The current Feature being processed.
featureIndex	number	The current index of the Feature being processed.

)

Returns

Reducer