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Using array predicates

An array predicate allows you to filter items by their position in the current context.

This predicate is used after a location step, in square brackets, to return one or more items based on their index. The table below describes the syntax to use.
Syntax Description Examples
[index] Returns the item with the specified index.
  • .customer[0] returns the first item in the customer array.
  • .customer[-1] returns the last item in the customer array.
[index:] Returns items whose index is equal to or greater than the specified index.
  • .customer[-3:] returns the last three items in the customer array.
  • .customer[2:] returns all items in the customer array starting from the third one.
[:index] Returns items whose index is equal to or lesser than the specified index.
Information noteNote: When used with a negative number, this syntax subtracts the specified value from the size of the array and compares the result to the indexes in the array. For example, for an array with 5 items, [:-2] returns all items whose index is lesser than or equal to 5-2, so it returns indexes 0 to 3 and only ignores the last item, which has the index 4.
  • .customer[:5] returns the first six items in the customer array.
  • .customer[:-2] returns all items in the customer array except for the last one.
[start_index:end_index] Returns items between the first index and the second index. Both the start index and the end indexes are included in the result.
  • .customer[2:5] returns the third, fourth, fifth and sixth items in the customer array.
  • .customer[-3:-2] returns the third and second items from the end of the customer array.
[*] Returns all items in the current context. .customer[*] returns all items in the customer array.

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