PRACTICAL GUIDEUnder review

LOOP and EXIT in repetition structures

Distinguishes skipping an iteration from ending a loop.

LOOP and EXIT in repetition structuresAdvPL

01 · OVERVIEW

Overview

LOOP skips the remaining iteration instructions; FOR still advances its counter and WHILE reevaluates its condition. EXIT transfers after NEXT/ENDDO. Neither automatically returns from the entire function. This example skips 2 and stops before printing 4. In WHILE, advance state before LOOP when needed for termination. (Sources: refs. 1–2.)

03 · PRACTICAL EXAMPLE

Commented example

#Include "Protheus.ch"

User Function Ed703()
    Local nItem
    For nItem := 1 To 5
        // Skip only this iteration.
        If nItem == 2
            Loop
        EndIf
        // End FOR without returning from the function.
        If nItem == 4
            Exit
        EndIf
        ConOut(nItem)
    Next
Return Nil

Expected result

Displays 1 and 3. Under review: editorial example neither compiled nor run in Protheus. Check includes, release, RDD and context before testing.

BEST PRACTICES

Loop exit still requires owned-resource cleanup and task-completion handling.
Under review: editorial example neither compiled nor run in Protheus. Check includes, release, RDD and context before testing.

LOOP and EXIT in repetition structures

Overview

Commented example

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