# intersect

Construct the intersection of two or more sets. Maintains order and multiplicity of the first argument for arrays and ranges.

## Examples

``````julia> set1 = Set(3, 4, 5, 6)
set2 = Set(1, 3, 4)
intersect(set1, set2)
Set{Int64}({4,3})``````
``````julia> set1 = Set(3, 4, 5, 6)
set2 = Set(1, 2)
intersect(set1, set2)
Set{Int64}({})``````
``````julia> a = Set([0:3:30]);   # table of 3

julia> b = Set([0:5:50]);   # table of 5

julia> intersect(a, b)
Set{Int64}({0,15,30})``````
1. Find the intersection of two arrays:

``````julia> arr1 = [1, 2, 3, 4, 5];
julia> arr2 = [4, 5, 6, 7, 8];
julia> intersect(arr1, arr2)
2-element Array{Int64,1}:
4
5``````

This example finds the common elements between `arr1` and `arr2` using the `intersect` function.

2. Find the intersection of multiple arrays:

``````julia> arr1 = [1, 2, 3, 4, 5];
julia> arr2 = [4, 5, 6, 7, 8];
julia> arr3 = [3, 4, 5, 9, 10];
julia> intersect(arr1, arr2, arr3)
2-element Array{Int64,1}:
4
5``````

In this example, the `intersect` function is used to find the common elements among `arr1`, `arr2`, and `arr3`.

3. Intersect two sets with different element types:
``````julia> set1 = Set([1, 2, 3, 4]);
julia> set2 = Set([3.0, 4.0, 5.0]);
julia> intersect(set1, set2)
Set{Float64} with 2 elements:
3.0
4.0``````

The `intersect` function can also be used to find the common elements between sets of different element types.

Common mistake example:

``````julia> intersect([1, 2, 3], (3, 4, 5))
ERROR: MethodError: no method matching intersect(::Array{Int64,1}, ::Tuple{Int64,Int64,Int64})``````

In this example, the `intersect` function is used with an array and a tuple. However, the `intersect` function does not support intersection between arrays and tuples. Make sure to provide valid arguments to the `intersect` function that are compatible with each other.