modern-abap-syntax

name

modern-abap-syntax

description

Help with modern ABAP syntax for Cloud Development including constructor expressions, inline declarations, string processing, dynamic programming, and built-in functions. Use when users ask about ABAP syntax, VALUE, COND, SWITCH, REDUCE, FILTER, FOR loops, string templates, Field Symbols, Date and Time functions, built-in functions, or numeric operations. Triggers include "constructor expression", "string template", "REDUCE", "VALUE", "inline declaration", "cú pháp abap", "abap syntax".

Modern ABAP Syntax

Guide for writing modern, efficient ABAP code focusing on ABAP for Cloud Development constructs.

Workflow

1. Determine the user's goal:

   • Refactoring old procedural ABAP into modern functional ABAP
   • Working with internal tables using constructor expressions
   • String concatenation and manipulation
   • Dynamic programming with field symbols and data references

2. Guide implementation using the correct modern language construct.

Quick Reference

Inline Declarations

" Variables
DATA(text) = `Hello World`.
DATA(number) = 42.

" Field Symbols
ASSIGN component 'NAME' OF STRUCTURE struct TO FIELD-SYMBOL(<value>).
LOOP AT itab ASSIGNING FIELD-SYMBOL(<line>).

Constructor Expressions

VALUE (Initialization)

" Initialize structures
DATA(struct) = VALUE zstruct( id = 1 name = 'Test' ).

" Initialize internal tables
DATA(itab) = VALUE ztab( 
  ( id = 1 name = 'One' ) 
  ( id = 2 name = 'Two' ) 
).

" Appending to existing table
itab = VALUE #( BASE itab ( id = 3 name = 'Three' ) ).

COND and SWITCH (Conditionals)

" COND (If-Else equivalent)
DATA(status_text) = COND string(
  WHEN status = 'N' THEN `New`
  WHEN status = 'P' THEN `Processing`
  ELSE `Unknown`
).

" SWITCH (Case equivalent)
DATA(priority) = SWITCH i( status
  WHEN 'N' THEN 1
  WHEN 'P' THEN 2
  ELSE 3
).

EXACT, REF, and CAST

" EXACT (Lossless assignment)
DATA(exact_val) = EXACT i( '123' ).

" REF (Data reference)
DATA(dref) = REF #( itab ).

" CAST (Downcast/Upcast)
DATA(interface_ref) = CAST zif_my_interface( class_instance ).

Internal Table Operations

FOR Iteration (Table Comprehension)

" Simple mapping
DATA(names) = VALUE string_table( FOR row IN itab ( row-name ) ).

" With WHERE condition
DATA(active_names) = VALUE string_table( 
  FOR row IN itab WHERE ( status = 'A' ) 
  ( row-name ) 
).

REDUCE (Aggregation)

" Summing values
DATA(total) = REDUCE i( 
  INIT sum = 0
  FOR row IN itab WHERE ( status = 'A' )
  NEXT sum = sum + row-amount 
).

FILTER (Filtering tables)

" Requires SORTED or HASHED table key
DATA(active_only) = FILTER #( itab USING KEY status_key WHERE status = 'A' ).

LINE_EXISTS and Table Indexing

IF line_exists( itab[ id = 123 ] ).
  DATA(line) = itab[ id = 123 ].
ENDIF.

" Safe read with OPTIONAL
DATA(line_safe) = VALUE #( itab[ id = 123 ] OPTIONAL ).

String Processing

" String Templates
DATA(msg) = |Hello { name }, your balance is { amount NUMBER = USER }|.

" Embedded formatting
DATA(date_str) = |{ sy-datum DATE = ISO }|.
DATA(alpha) = |{ customer_id ALPHA = OUT }|.

" String expressions
DATA(concat) = `Prefix` && `Suffix`.

Built-In Functions

" String functions
DATA(upper) = to_upper( text ).
DATA(lower) = to_lower( text ).
DATA(len) = strlen( text ).
DATA(pos) = find( val = text sub = 'AB' ).
DATA(replaced) = replace( val = text sub = 'X' with = 'Y' ).

" Table functions
DATA(count) = lines( itab ).

Dynamic Programming

" Assign component dynamically
ASSIGN COMPONENT 'FIELD_NAME' OF STRUCTURE struct TO FIELD-SYMBOL(<field>).
IF sy-subrc = 0.
  <field> = 'New Value'.
ENDIF.

" Create data dynamically (RTTC)
DATA dref TYPE REF TO data.
CREATE DATA dref TYPE (type_name).
ASSIGN dref->* TO FIELD-SYMBOL(<dyn_data>).

References

• SAP ABAP Cheat Sheets — Constructor Expressions, Internal Tables, String Processing, Dynamic Programming.