GroupBy Lambda Expression Sample in C#

GroupBy

GroupBy: Projects elements of a collection into groups by key.
GroupBy: Projects elements of a collection into groups by key.

This Lambda Expression sample splits array of numbers into two groups: one which is divisible by 10, and one which is not.
This Lambda Expression sample splits array of numbers into two groups: one which is divisible by 10, and one which is not.

static void Sample_GroupBy_Linq()
{
    int[] numbers = { 10, 15, 20, 25, 30, 35 };

    var result = from n in numbers
                 group n by (n % 10 == 0) into groups
                 select groups;

    Debug.WriteLine("GroupBy has created two groups:");
    foreach (IGrouping<bool, int> group in result)
    {
        if (group.Key == true)
            Debug.WriteLine("Divisible by 10");
        else
            Debug.WriteLine("Not Divisible by 10");

        foreach (int number in group)
            Debug.WriteLine(number);
    }
}

Output:

GroupBy has created two groups:
Divisible by 10
10
20
30
Not Divisible by 10
15
25
35

let Sample_GroupBy_Lambda() =
    let numbers = [|10; 15; 20; 25; 30; 35|]

    let result = numbers.GroupBy(fun n -> (n % 10 = 0));

    Debug.WriteLine(sprintf "GroupBy has created two groups:")

    for group in result do
        if group.Key = true
        then Debug.WriteLine(sprintf "Divisible by 10")
        else Debug.WriteLine(sprintf "Not divisible by 10")

        for number in group do
            Debug.WriteLine(sprintf "%d" number)

Output:

Divisible by 10
10
20
30
Not divisible by 10
15
25
35

static void Sample_GroupBy_Lambda()
{
    int[] numbers = { 10, 15, 20, 25, 30, 35 };

    var result = numbers.GroupBy(n => (n % 10 == 0));

    Debug.WriteLine("GroupBy has created two groups:");
    foreach (IGrouping<bool, int> group in result)
    {
        if (group.Key == true)
            Debug.WriteLine("Divisible by 10");
        else
            Debug.WriteLine("Not Divisible by 10");

        foreach (int number in group)
            Debug.WriteLine(number);
    }
}

Output:

GroupBy has created two groups:
Divisible by 10
10
20
30
Not Divisible by 10
15
25
35

Private Shared Sub Sample_GroupBy_Lambda()
    Dim numbers As Integer() = {10, 15, 20, 25, 30, 35}

    Dim result = numbers.GroupBy(Function(n) (n Mod 10 = 0))

    Debug.WriteLine("GroupBy has created two groups:")
    For Each group As IGrouping(Of Boolean, Integer) In result
        If group.Key = True Then
            Debug.WriteLine("Divisible by 10")
        Else
            Debug.WriteLine("Not Divisible by 10")
        End If

        For Each number As Integer In group
            Debug.WriteLine(number)
        Next
    Next
End Sub

Output:

GroupBy has created two groups:
Divisible by 10
10
20
30
Not Divisible by 10
15
25
35

Aggregation

Conversion

Element

Generation

Grouping

Join

Ordering

Other

Partitioning

Projection

Quantifiers

Restriction

Set

GroupBy