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• FOR ABAP_EXPRESSION
FOR, Iteration Expressions
ABAP_SYNTAX ... REDUCE$| NEW$| VALUE type( ... FOR ... UNTIL$|WHILE ... $| ... IN ... ...) ...
What does it do? The language element FOR introduces an iteration expression as a subexpression in constructor expressions with the reduction operator REDUCE and in the variants of the instance operator NEW and the value operator VALUE for creating internal tables. There are two main variants of iteration expressions:
Iteration expressions with UNTIL or WHILE for conditional iterations. These expressions are used to iteratively create the results of any data types using REDUCE or to create lines of internal tables using NEW or VALUE. The iteration steps can be defined as required.
Iteration expressions with IN for table iterations. These expressions are used for table reductions using REDUCE or table comprehensions using NEW or VALUE. The iteration steps here evaluate an existing internal table.
Latest notes:
Any FOR variants can be used in any way in a constructor expression and produce nested iterations.
The reduction operator REDUCE must contain at least one iteration expression. The variants of the instance operator NEW and the value operator VALUE for creating internal tables can contain iteration expressions.
The conditional iterations using UNTIL or WHILE provide an expression-oriented alternative to the loop statements DO and WHILE. The same applies to the table iterations using IN and the statement LOOP. The direct use of operand positions on the expression-oriented variants helps to avoid helper variables. Furthermore, they also enable certain tasks, such as creating values iteratively, to be expressed more concisely and more elegantly. NON_V5_HINTS ABAP_HINT_END
