Function head() returns the first element of the array, namely, the element with index [0].

Arguments：

• Array <array>

Returns：

• First element <string>

Constant

Example: Return the 1st element of array [[1,2,3],[4,5,6]]

return head([[1,2,3],[4,5,6]])

Function

Example: Return the 1st element of each array in an array list

uncollect [[1,2,3],[4,5,6]] as a
return head(collect(a))

Alias

Example: Return the 1st element of each array in an array list

uncollect [[1,2,3],[4,5,6]] as a
return head(a)