FILTER - Iterator

Filters an array with a given predicate.

Details

The first parameter has to be an array pointer. For every array child the second parameter is evaluated. If it returns true, the value is kept. To actually use the values of the children, a relative pointer should be used.

Input parameters

Name	Type	Optional	Description
iteratable	Object/Array	False	Object or Array to iterate
predicate	Bool	False	Predicate to evaluate for each child

Output

Array: An array containing only the children for which the predicate returned true

Usage

FILTER(<iteratable>, <predicate>)

Examples

Example 1

Input Document

[1,true,3,"4"]

Query

LOAD tmp
AS ('': FILTER('',  ISNUMBER($'')))

Result

[1,3]

Example 2

Input Document

[{"num":1},{"num":2},{"num":3},{"num":4}]

Query

LOAD tmp
AS ('': FILTER('',  $'/num' > 2))

Result

[{"num":3},{"num":4}]