Assertion: filter's element | /r/HasProperty | changed
Facets:
value: each time
type: TEMPORAL
value: periodically
type: TEMPORAL
Source sentences:
text: If existing elements of the array are changed, or deleted, their value as passed to callback will be the value at the time filter() visits them; elements that are deleted are not visited.
text: As with the Primary Filter, the element has to be changed periodically and frequently.
text: And each time the element is changed, a gallon of fresh oil is added.