ARRAY OBJECT

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4D v20.6

ARRAY OBJECT


ARRAY OBJECT ( arrayName ; size {; size2} )

Parameter	Type	Description
arrayName	Array	Name of array
size	Longint	Number of array elements or Number of arrays if size2 is specified
size2	Longint	Number of 2D array elements

Description

The ARRAY OBJECT command creates and/or resizes an array of language Object type elements in memory.

The arrayName parameter is the name of the array. You can use any name that conforms to 4D conventions.

The size parameter is the number of array elements.

The size2 parameter is optional. If you pass it, this command creates a two-dimensional array. In this case, size specifies the number of rows and size2 the number of columns in each array. Each row in a two-dimensional array can be processed both as an element and an array. This means that when you work with the first dimension of a two-dimensional array, you can insert and remove entire arrays using other commands in the "Arrays" theme.

When you apply the ARRAY OBJECT command to an existing array:

If you enlarge its size, existing elements are not changed and new elements are undefined. You can test whether an element is defined using the OB Is defined command.
If you reduce its size, elements at the "bottom" of the array are deleted and lost.

 C_OBJECT($Children;$ref_richard;$ref_susan;$ref_james)

 ARRAY OBJECT($arrayChildren;0)

 OB SET($ref_richard;"name";"Richard";"age";7)

 APPEND TO ARRAY($arrayChildren;$ref_richard)

 OB SET($ref_susan;"name";"Susan";"age";4)

 APPEND TO ARRAY($arrayChildren;$ref_susan)

 OB SET($ref_james;"name";"James";"age";3)

 APPEND TO ARRAY($arrayChildren;$ref_james)

  // $arrayChildren{1} -> {"name":"Richard","age":7}

  // $arrayChildren{2} -> {"name":"Susan","age":4}

  // $arrayChildren{3} -> {"name":"James","age":3}

ARRAY OBJECT

Description

Example 1

Example 2

Example 3