Count in array

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4D v20 R7

Count in array


Count in array ( array ; value ) -> Function result

Parameter	Type	Description
array	Array	Array where count should occur
value	Expression	Value to count
Function result	Longint	Number of instances found

Description

The Count in array command returns the number of times value is found in array.

This command can be used with the following array types: Text, number, Date, Pointer, Object, and Boolean. The array and value parameters must be the same type or compatible.

Note: With Object arrays, you can only use object references in the value parameter.

If no element in array matches value, the command returns 0.

Example 1

The following example allows displaying the number of selected lines in a list box:

  //tBList is the name of a List box column array

 ALERT(String(Count in array(tBList;True))+" line(s) selected in the list box")

Example 2

You want to count object references in an object array:

 ARRAY OBJECT($objects;100)

 $o1:={a10;b"xyz"}

 $o2:={a10;b"xyz"}

 

 $objects{20}:=$o1

 $objects{21}:=$o1

 $objects{22}:=$o1

 

 var $n : Integer

 

 $n:=Count in array($objects;$o1) // n = 3 

 $n:=Count in array($objects;$o2) // n = 0