MemPrevious (Function)

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Sorting the memory zone
Existence of memory zone
Performing a search in a memory zone
Equivalence

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MemPrevious (Function)

In french: MemPrécédent

Warning
From version 20, this feature is kept for backward compatibility. We recommend that you use the Associative arrays.

Positions on the element found before the current element of a memory zone and returns the value of this element.

Example

// Positions on the previous element found in "MyMemoryZone"
// and returns the value of this element
ResPrevious = MemPrevious("MyMemoryZone")

Syntax

<Result> = MemPrevious(<Memory zone>)

<Result>: Any type

If the previous element exists: return value of the previous element, defined by MemAdd or MemModify.
If the previous element does not exist: an empty string ("").

<Memory zone>: Character string (with quotes)

Name of memory zone, defined by MemCreate.

Remarks

Sorting the memory zone

The sorts performed by MemSort are taken into account during the call to MemPrevious.

If no sort was requested by MemSort, MemPrevious returns the value of the previous element according to the order of the elements added by MemAdd.

Existence of memory zone

The existence of the memory zone is not checked.

If the specified memory zone does not exist, a WLanguage error occurs when MemPrevious is used.

To check the existence of a memory zone, use MemExist.

Performing a search in a memory zone

If MemSeek is used before the call to MemPrevious, MemPrevious will be positioned on the previous element sought.

Equivalence

The two following syntaxes are equivalent:

Res = MemPrevious(<Memory zone>)

Res = MemRetrieve(<Memory zone>, MemCurrent(<Memory zone>)-1)

Business / UI classification : Neutral code

Component : wd260std.dll