1 files changed, 68 insertions, 0 deletions
diff --git a/jstests/core/slice1.js b/jstests/core/slice1.js
new file mode 100644
index 00000000000..b20e7e48b14
--- /dev/null
+++ b/jstests/core/slice1.js
@@ -0,0 +1,68 @@
+t = db.slice1;
+t.drop();
+
+t.insert({_id:1, a:[0,1,2,3,4,5,-5,-4,-3,-2,-1], b:1, c:1});
+
+// first three
+out = t.findOne({}, {a:{$slice:3}});
+assert.eq(out.a , [0,1,2], '1');
+
+// last three
+out = t.findOne({}, {a:{$slice:-3}});
+assert.eq(out.a , [-3, -2, -1], '2');
+
+// skip 2, limit 3
+out = t.findOne({}, {a:{$slice:[2, 3]}});
+assert.eq(out.a , [2,3,4], '3');
+
+// skip to fifth from last, limit 4
+out = t.findOne({}, {a:{$slice:[-5, 4]}});
+assert.eq(out.a , [-5, -4, -3, -2], '4');
+
+// skip to fifth from last, limit 10
+out = t.findOne({}, {a:{$slice:[-5, 10]}});
+assert.eq(out.a , [-5, -4, -3, -2, -1], '5');
+
+
+// interaction with other fields
+
+out = t.findOne({}, {a:{$slice:3}});
+assert.eq(out.a , [0,1,2], 'A 1');
+assert.eq(out.b , 1, 'A 2');
+assert.eq(out.c , 1, 'A 3');
+
+out = t.findOne({}, {a:{$slice:3}, b:true});
+assert.eq(out.a , [0,1,2], 'B 1');
+assert.eq(out.b , 1, 'B 2');
+assert.eq(out.c , undefined);
+
+out = t.findOne({}, {a:{$slice:3}, b:false});
+assert.eq(out.a , [0,1,2]);
+assert.eq(out.b , undefined);
+assert.eq(out.c , 1);
+
+t.drop()
+t.insert({comments: [{id:0, text:'a'},{id:1, text:'b'},{id:2, text:'c'},{id:3, text:'d'}], title:'foo'})
+
+
+out = t.findOne({}, {comments:{$slice:2}, 'comments.id':true});
+assert.eq(out.comments , [{id:0}, {id:1}]);
+assert.eq(out.title , undefined);
+
+out = t.findOne({}, {comments:{$slice:2}, 'comments.id':false});
+assert.eq(out.comments , [{text: 'a'}, {text: 'b'}]);
+assert.eq(out.title , 'foo');
+
+//nested arrays
+t.drop();
+t.insert({_id:1, a:[[1,1,1], [2,2,2], [3,3,3]], b:1, c:1});
+
+out = t.findOne({}, {a:{$slice:1}});
+assert.eq(out.a , [[1,1,1]], 'n 1');
+
+out = t.findOne({}, {a:{$slice:-1}});
+assert.eq(out.a , [[3,3,3]], 'n 2');
+
+out = t.findOne({}, {a:{$slice:[0,2]}});
+assert.eq(out.a , [[1,1,1],[2,2,2]], 'n 2');
+