Oracle PL/SQL name resolution

I can't understand this example of Oracle documentation.  Someone can give me a little more information, and what Oracle has provided.  I give the link where it was found.  Thank you

http://docs.Oracle.com/CD/E11882_01/AppDev.112/e25519/nameresolution.htm#LNPLS01702

n: = f2 (10) (10) .to. -Call for a follow-up function name indexed

- and followed by the name of the component

The f2 function takes a whole parameter. It is therefore a valid call to the function with the parameter value 10:

F2 (10)

The function returns an array. The appellant wants the value to 10 in this table. If this refers to the position of the table, through the call to f2:

F2 (10) (10)

The table is an array of records, where each record has a unique field called a. So the following references field one, in the table to 10from the table returned by f2, f2 being passed with the value of the parameter to 10:

F2 (10) (10) .at

This is equivalent to:

resArray: = f2 (10); -to get the result of the function table

arrRec: = resArray (10);  -get the 10th element of the array

NUM: = arrRec.a; -read the field labeled 'a' of the folder

Tags: Database

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