arrayAddElementIfNotExist

Description

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.

Parameters

Return Type

Array

Examples

Example 1

watchers2 = addElementIfNotExist(watchers, currentUser());

Adds currentUser to the watchers array if currentUser is not already present. The function 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 function call.

If arrayName is not defined as an array, the function returns error.
If elem is not the same type as declared in the array definition, the function returns error.