New list

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4D v20 R7

New list


New list -> Function result

Parameter	Type	Description
Function result	ListRef	List reference number

Description

New list creates a new, empty hierarchical list in memory and returns its unique list reference number.

WARNING: Hierarchical lists are held in memory. When you are finished with a hierarchical list, it is important to dispose of it and free the memory, using the command CLEAR LIST.

Several other commands allow you to create hierarchical lists:

Copy list duplicates a list from an existing list.
Load list creates a list by loading a Choice List created (manually or programmatically) in the Design enviornment List Editor.
BLOB to list creates a list from the contents of a BLOB in which a list was previously saved.

After you have created a hierarchical list using New list, you can:

Add items to that list, using the command APPEND TO LIST or INSERT IN LIST.
Delete items from that list, using the command DELETE FROM LIST.

Example

See example for the APPEND TO LIST command.