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danrega
2024-01-10 17:02:33 +01:00
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01_Internal_Tables.md
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@@ -11,6 +11,7 @@
- [Excursions with Internal Tables](#excursions-with-internal-tables)
- [Reading from Internal Tables](#reading-from-internal-tables)
- [Processing Multiple Internal Table Lines Sequentially](#processing-multiple-internal-table-lines-sequentially)
- [Iteration Expressions](#iteration-expressions)
- [Sorting Internal Tables](#sorting-internal-tables)
- [Modifying Internal Table Content](#modifying-internal-table-content)
- [Deleting Internal Table Content](#deleting-internal-table-content)
@@ -1218,25 +1219,15 @@ LOOP AT it INTO wa FROM 6 TO 3 STEP -2.
ENDLOOP.
```
*Iterations with* `FOR`
### Iteration Expressions
Iteration expressions with [`FOR`](https://help.sap.com/doc/abapdocu_cp_index_htm/CLOUD/en-US/index.htm?file=abenfor.htm) as part of certain constructor expressions allow you to create content of an internal table by evaluating one or more source tables.
The following examples show iterations with `FOR` within a constructor expression with `VALUE`. A new table is created and
values for two fields are inserted into the new table, which has the internal table type of the source table. `ls` represents an iteration
variable that holds the data as the table is looped over. The components, and thus the table line to be returned, are
specified within the pair of parentheses before the closing parenthesis. Both examples set specific values for the components. The second example also includes a `WHERE` clause to restrict the lines to be copied.
The expressions are covered in the cheat sheet [Constructor Expressions](05_Constructor_Expressions.md):
- [Iteration Expressions Using FOR](05_Constructor_Expressions.md#iteration-expressions-using-for)
- Special reduction operator `REDUCE` that is based on iteration expressions: [REDUCE](05_Constructor_Expressions.md#reduce)
Unlike `LOOP` statements, this sequential processing cannot be debugged.
``` abap
"Internal table type
TYPES ttype like it.
DATA(tab1) = VALUE ttype( FOR ls IN it ( a = ls-a b = 9 ) ).
DATA(tab2) = VALUE ttype( FOR ls IN it WHERE ( a < 7 )
( a = ls-a b = ls-b + 5 ) ).
```
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