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.

Versions 15 and later

This function is now available for Android applications.

New in version 15

This function is now available for Android applications.

Versions 17 and later

This function is now available for iPhone/iPad applications.

New in version 17

This function is now available for iPhone/iPad applications.

Versions 18 and later

This function is now available in Windows Store apps mode.

This function is now available in Android Widget mode.

New in version 18

This function is now available in Windows Store apps mode.

This function is now available in Android Widget mode.

This function is now available in Windows Store apps mode.

This function is now available in Android Widget mode.

Versions 22 and later

This function is now available in Universal Windows 10 App mode.

New in version 22

This function is now available in Universal Windows 10 App mode.

Example

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

Syntax

<Result> = MemPrevious(<Name of 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 ("").

<Name of 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 <Name of Memory Zone> does not exist, a WLanguage error occurs when MemPrevious is run.

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(<Name of Memory Zone>)

Res = MemRetrieve(<Name of Memory Zone>, MemCurrent(<Name of Memory Zone>)-1)

Component : wd250std.dll