Tech Tip: New .first() function in the Collection Class

PRODUCT: 4D | VERSION: 20 | PLATFORM: Mac & Win

Published On: July 20, 2023

As of 4D V20, the .first() function can be called on a Collection. The .first() function returns the first element of the collection.

Note:
This function does not modify the original collection.
Returns Undefined if the collection is empty

Collection Example:

var $col; $emptyCol : Collection
var $first : Variant
$col:=New collection("hello"; 10; 20; 30; "world")
$first:=$col.first() // "hello"

$emptyCol:=New collection()
// $first:=$emptyCol[0] //would return error
$first:=$emptyCol.first() // returns Undefined