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Help / WLanguage / WLanguage functions / Standard functions / Memory area functions
  • Sorting the memory area
  • Existence of memory area
  • Performing a search in a memory area
  • Equivalence
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Stored procedures
Warning
From version 20, this feature is kept for backward compatibility. We recommend that you use 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 area>)
<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 area>: Character string
Name of the memory area, defined by MemCreate.
Remarks

Sorting the memory area

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 area

The existence of the memory zone is not checked.
If the specified memory area does not exist, a WLanguage error occurs when MemPrevious is used.
To check the existence of a memory area, use MemExist.

Performing a search in a memory area

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 area>)

Res = MemRetrieve(<Memory area>, MemCurrent(<Memory area>)-1)
Business / UI classification: Neutral code
Component: wd290std.dll
Minimum version required
  • Version 9
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Last update: 05/26/2022

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