If elem is an element of the array type, returns a new array that includes the specified element at the end. The element is added only if it is not already in the array.


Return Type



Example 1

watchers2 = addElementIfNotExist(watchers, currentUser());

Adds currentUser to the watchers array if currentUser is not already present. The routine returns a new array watchers2, so the initial array will not be modified.

Example 2

watchers = addElementIfNotExist(watchers, currentUser());

The initial array will be modified as a result of the = operator and NOT of the routine call.


  1. If arrayName is not defined as an array, the routine returns error.

  2. If elem is not the same type as declared in the array definition, the routine returns error.


See also