ABAP Language Modernization

• QuestionWhat is "Obsolete language elements to hunt"?Tap to revealAnswerHunt the obsolete constructs — MOVE, MOVE-CORRESPONDING, header lines, FORM/PERFORM, TABLES, DESCRIBE, double-negative CHECK, CONCATENATE — and swap each for its modern, inlinable equivalent.
• QuestionIn "Obsolete language elements to hunt", explain:Tap to revealAnswerMOVE → b = a; MOVE-CORRESPONDING → CORRESPONDING #( ).
• QuestionIn "Obsolete language elements to hunt", explain:Tap to revealAnswerLOOP AT itab. (header line) → LOOP AT itab ASSIGNING FIELD-SYMBOL(<fs>).
• QuestionIn "Obsolete language elements to hunt", explain:Tap to revealAnswerOCCURS/header lines → typed tables; FORM/PERFORM → methods; drop TABLES outside dynpros.
• QuestionIn "Obsolete language elements to hunt", explain:Tap to revealAnswerDESCRIBE TABLE ... LINES → lines( ); CHECK NOT .. IS INITIAL → IF .. IS NOT INITIAL.
• QuestionAnalogy for "Obsolete language elements to hunt":Tap to revealAnswerIt is replacing worn-out hand tools with the modern power-tool equivalents — same job, far less effort and risk.
• QuestionWhat is "Inline declarations & modern Open SQL"?Tap to revealAnswerModern Open SQL uses a comma-separated field list and an inline @DATA(...) target, which makes INTO CORRESPONDING FIELDS unnecessary when the table mirrors the list.
• QuestionIn "Inline declarations & modern Open SQL", explain:Tap to revealAnswerUse @DATA(...) to declare the target inline at the point of the SELECT.
• QuestionIn "Inline declarations & modern Open SQL", explain:Tap to revealAnswerComma-separated field list is required in modern (strict) Open SQL.
• QuestionIn "Inline declarations & modern Open SQL", explain:Tap to revealAnswerHost variables need the @ escape in WHERE and INTO.
• QuestionIn "Inline declarations & modern Open SQL", explain:Tap to revealAnswerDrop INTO CORRESPONDING FIELDS when the inline table mirrors the field list exactly.
• QuestionAnalogy for "Inline declarations & modern Open SQL":Tap to revealAnswerInstead of pre-labelling empty boxes and hoping they match, you let the packing list cut the boxes to fit exactly.
• QuestionWhat is "Constructor operators worth memorizing"?Tap to revealAnswerMemorize VALUE, CORRESPONDING, COND, SWITCH, REDUCE, FILTER, and FOR..IN — but remember FILTER needs a SORTED or HASHED secondary key or it will not activate.
• QuestionIn "Constructor operators worth memorizing", explain:Tap to revealAnswerVALUE builds structures/tables; CORRESPONDING maps them (with optional MAPPING).
• QuestionIn "Constructor operators worth memorizing", explain:Tap to revealAnswerCOND is expression if/else; SWITCH is expression case; REDUCE folds to one value.
• QuestionIn "Constructor operators worth memorizing", explain:Tap to revealAnswerFOR .. IN is a table comprehension; FILTER selects rows by condition.
• QuestionIn "Constructor operators worth memorizing", explain:Tap to revealAnswerFILTER needs a SORTED/HASHED secondary key or it raises a syntax error.
• QuestionAnalogy for "Constructor operators worth memorizing":Tap to revealAnswerThey are the power verbs of ABAP — say 'build this,' 'map that,' 'fold to a total' in one breath instead of narrating every loop step.
• QuestionWhat is "String templates"?Tap to revealAnswerString templates |...{ var }...| replace CONCATENATE and format inline with options like ALPHA, DATE = ISO, NUMBER = USER, and WIDTH/ALIGN/PAD.
• QuestionIn "String templates", explain:Tap to revealAnswer|...{ var }...| inserts evaluated expressions into literal text.
• QuestionIn "String templates", explain:Tap to revealAnswerALPHA = IN/OUT handles alpha (leading-zero) conversion inline.
• QuestionIn "String templates", explain:Tap to revealAnswerDATE = ISO / TIME = ISO render ISO date and time; NUMBER = USER formats per user settings.
• QuestionIn "String templates", explain:Tap to revealAnswerWIDTH / ALIGN / PAD give fixed-width, aligned, padded output.
• QuestionAnalogy for "String templates":Tap to revealAnswerIt is a fill-in-the-blanks sentence — write the text once with slots, and each slot formats and inserts its value.
• QuestionWhat is "Class-based exceptions"?Tap to revealAnswerInherit CX_STATIC_CHECK (declared, compiler-enforced — the Clean ABAP default) over CX_DYNAMIC_CHECK or CX_NO_CHECK, use IF_T100_MESSAGE for texts, and prefer ASSERT for can't-happen cases.
• QuestionIn "Class-based exceptions", explain:Tap to revealAnswerCX_STATIC_CHECK: declared in the signature, compiler-enforced — the Clean ABAP default.
• QuestionIn "Class-based exceptions", explain:Tap to revealAnswerCX_DYNAMIC_CHECK: not declared, checked at runtime.
• QuestionIn "Class-based exceptions", explain:Tap to revealAnswerCX_NO_CHECK: propagates silently, no declaration, no caller obligation.
• QuestionIn "Class-based exceptions", explain:Tap to revealAnswerImplement IF_T100_MESSAGE for proper, translatable exception texts.
• QuestionAnalogy for "Class-based exceptions":Tap to revealAnswerCX_STATIC_CHECK is a contract the compiler signs for you; CX_NO_CHECK is an unsigned IOU that may quietly bounce.

1. 1Map the core idea

   Analyse~10 min

   In your own words, map the central idea of "Obsolete language elements to hunt". Aim for one paragraph, no jargon you haven't earned.

   Done when: A non-expert could read your paragraph and explain it back to you.

   Re-read the source concept

2. 2Use it to a real situation

   Apply~15 min

   Find a real situation from your own work / life where "Class-based exceptions" applies. Use the idea — describe the situation, the move you'd make, and the alternative you considered first.

   Done when: You can name a specific situation (not a hypothetical), state your move, and explain the trade-off in one paragraph.

   Re-read the source concept

3. 3Teach it back

   Evaluate~5 min

   Pick someone (a colleague, a peer, a rubber duck) and explain the section to them in under 5 minutes. Use your own example, not the one from the lesson.

   Done when: Your listener can repeat the core idea + the trade-off back to you without prompting.

Why this matters. Reading + quizzing prove recall; applying it in a real situation is the only evidence of transfer. Treat at least one of these as non-negotiable before you move on.