Array slicing refers to using a subset of an array. N1QL allows slices to appear anywhere that other expressions can appear.
The query on the right will return all the children between offset 0 and 2
N1QL also supports ARRAY functions such as ARRAY_PREPEND, ARRAY_APPEND and ARRAY_CONCAT. Try typing out the following query
SELECT ARRAY_CONCAT(children[0:1], children[1:]) FROM tutorial
SELECT children[0:2] FROM tutorial WHERE children[0:2] IS NOT MISSING