fun/array/union

Returns the union of the given sets; that is, a set consisting of all distinct elements in the input sets.

Syntax

arr = union(... sets)

Parameters

• ... sets The sets used to produce the union.

Examples

union([1, 2, 3], [4, 2, 1, 5], [2, 1]) // [1, 2, 3, 4, 5]

Input sets are not flattened:

union([1, 2, 3], [3, 4, 5], [5, [6, 7]]) // [1, 2, 3, 4, 5, [6, 7]]

Holes are preserved:

union([1, 2, , 3], [3, 4, 5], [5]) // [ 1, 2, undefined, 3, 4, 5 ]

Input that can't be converted to an array will yield the empty set:

union(1, 2) // []
union({})   // []