AdvPL good practices guide

Overview

The official guide groups conventions, structure, performance and techniques. This subset turns that scope into practical review: declare locals, separate calculations from external effects, validate types and release owned resources. It is neither a full reproduction nor a universal style requirement. The example calculates a total in memory with explicit validation. (Sources: refs. 1–1.)

Syntax

Validate input → calculate → handle external effects

Commented example

#Include "Protheus.ch"

User Function Ed479()
    Local nQty := 3
    Local nUnit := 12.50
    Local nTotal := 0
    // Pure calculation separated from persistence.
    If ValType(nQty) == "N"
        If ValType(nUnit) == "N"
            If nQty >= 0 .And. nUnit >= 0
                nTotal := nQty * nUnit
            EndIf
        EndIf
    EndIf
    ConOut(cValToChar(nTotal))
Return Nil

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