Soenneker.Extensions.Enumerable

A collection of helpful enumerable extension methods

Installation

dotnet add package Soenneker.Extensions.Enumerable

Usage

IEnumerable should have IsNullOrEmpty() too

var populatedList = new List<string>{"foo", "bar", "foo"};

populatedList.IsNullOrEmpty() // false

populatedList.Populated() // true
populatedList.None() // false

One call checking for null and contains any elements

List<string>? nullList = null;

nullList.IsNullOrEmpty() // true
nullList.Populated() // false

Duplicate handling

var containsDuplicates = populatedList.ContainsDuplicates(); // true

var deduped = populatedList.RemoveDuplicates(); // {"foo", "bar"}

Recursive flattening

public class Node 
{
    public string Name {get; set;}
    public List<Node> Children {get; set;}
}

void Example()
{
    var node = new Node(){ Name = "Node1" };
    node.Children = new List()
    {
        new Node() 
        {
            Name = "Node2"
        }
    }

    List<Node>? children = node.Children.ToFlattenedFromRecursive(c => c.Children);

    // Results in flattened List:
    // { Node1, Node2 }
}