array:head
Returns the first member of an array, that is $array(1).
Signature
array:head($array as array(*)) as item()*Properties
This function is deterministic, context-independent, and focus-independent.
Rules
The function returns first member of $array, that is the value of $array(1).
Error Conditions
A dynamic error occurs [ERRFOAY0001] if $array is empty.
Examples
The expression array:head([5, 6, 7, 8]) returns 5.
The expression array:head([["a", "b"], ["c", "d"]]) returns ["a", "b"].
The expression array:head([("a", "b"), ("c", "d")]) returns "a", "b".