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10.8. Map Operator

JSONiq provides a shortcut for a for-return construct, automatically binding each item in the left-hand-side sequence to the context item.
Example 10.21. A simple map.
(1 to 10) ! ($$ * 2)
Results: 
2
4
6
8
10
12
14
16
18
20

Example 10.22. An equivalent query.
for $i in 1 to 10
return $i * 2
Results: 
2
4
6
8
10
12
14
16
18
20