Beheld Basal Software Tutorials - Tutorial Addendum - Arrangement Acknowledgment and Congenital Functions

This affiliate describes:

    

    
• What Is an Array?


    
• Array Capricious Declaration


    
• Assigning Ethics to Arrangement Elements


    
• Retrieving Ethics from Arrangement Elements


    
• Fixed-Size Arrangement Example


    
• Dynamic-Size Arrangement Example


    
• "Array" Action and "For Each" Example


    
• "Erase" Statements


    

What Is an Array?

    

Like some additional programming languages, Beheld Basal abutment the abstraction of arrangement as a congenital data structure

    

with the afterward features:

    

    
• An arrangement can be acclimated to abundance a accumulating of data elements of the aforementioned data type.


    
• The amount of elements in an arrangement can be a anchored amount or can be re-adjusted dynamically.


    
• An arrangement haveto be associated with a capricious for referencing.


    
• Each aspect in an arrangement is associated with a different basis number. By default, basis amount starts from 0.


    
• A specific aspect in an arrangement can be referred by the basis number.


    
• A amount of congenital functions are provided to plan with arrays.


    
• "For Each" bend account is provided as an simple way to bend through all elements in an array.


    
• "Erase" account is provided as a quick way to abolish all ethics from an array.


    

Array Capricious Declaration

    

Visual Basal supports a amount of means to acknowledge arrangement variables:

    

1. Absolute Acknowledgment with Anchored Admeasurement - Using "Dim" account with admeasurement included as:

    

    
   Dim variable_name(upper_bound) [As data_type]

    

where "upper_bound" is absolute accumulation allegorical the high apprenticed of the aspect index,

    

and "data_type" is a data blazon keyword.

    

Array declared in this way has a anchored admeasurement (number of elements).

    

By default, the admeasurement of an arrangement is the high apprenticed additional 1, because basis starts from 0.

    

This admeasurement can not be changed. If "As data_type" is not specified, absence data blazon "Variant" will be used.

    

2. Absolute Acknowledgment with Activating Admeasurement - Using "Dim" and "ReDim" statements as apparent in the following

    

syntax:

    

    
   Dim variable_name() [As data_type]

    
   ... 

    
   ReDim [Preserve] variable_name(upper_bound)

    
   ...

    

The "Dim" account declares an arrangement capricious after any high bound. The "ReDim" account resets

    

the high apprenticed to a new value. The alternative key chat "Preserve" specifies that all old elements

    

must be preserved if resetting the arrangement size. Arrangement declared in this way can be resized at any time.

    

3. Absolute Acknowledgment with "Array" Action - Using "Array" action as apparent in the afterward

    

syntax:

    

    
   variable_name = Array(element_1, element_2, ...)

    

The "Array" action takes a account of ethics of "Variant" type, and allotment a dynamic-size array.

    

Note that already an arrangement is declared, all elements will accept absence ethics based. See additional affiliate

    

for altered absence ethics for altered data types.

    

VB offers some additional advantageous functions and statements for you to plan with arrays:

    

    
• IsArray(variable_name) - Allotment "True" if the defined capricious is an array.


    
• UBound(array_variable) - Allotment the high apprenticed of the defined array.


    
• LBound(array_variable) - Allotment the lower apprenticed of the defined array.


    
• "For Each" - Loops through all elements in an array.


    
• "Erase" - Removes all ethics from an array.


    

See sections beneath for data and examples on those functions and statements.

    

(Continued on next part...)