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Merged
uw4 merged 1 commit into from
Dec 5, 2025
Merged

negative index #77 #78

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2 changes: 1 addition & 1 deletion src/main/java/com/dashjoin/jsonata/Jsonata.java
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Original file line number Diff line number Diff line change
Expand Up @@ -500,7 +500,7 @@ Frame createFrameFromTuple(Frame environment, Map<String, Object> tuple) {
// count in from end of array
index = ((List)input).size() + index;
}
var item = index<((List)input).size() ? ((List)input).get(index) : null;
var item = 0<=index && index<((List)input).size() ? ((List)input).get(index) : null;
if(item != null) {
if(item instanceof List) {
results = (List)item;
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8 changes: 8 additions & 0 deletions src/test/java/com/dashjoin/jsonata/ArrayTest.java
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Expand Up @@ -13,6 +13,14 @@

public class ArrayTest {

@Test
public void testNegativeIndex() {
Jsonata expr = jsonata("item[-1]");
Assertions.assertNull(expr.evaluate(Map.of("item", List.of())));
expr = jsonata("$[-1]");
Assertions.assertNull(expr.evaluate(List.of()));
}

@Test
public void testArray() {
Jsonata expr1 = jsonata("{'key': $append($.[{'x': 'y'}],$.[{'a': 'b'}])}");
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