🧪 DEMOS

TL;DR

Examples, Experiments, Research
Look. Try. Add.

About

👋 Welcome! This is the personal repository of a Full-Stack developer (.NET, C++, Angular), where I collect everything I’ve learned or discovered in real projects.

🔬 I don’t just read theory – I want to see how it works in practice! Here you’ll find hands-on examples of basic tools and practical solutions to complex problems you can try yourself.

💡 Even simple concepts are easy to forget, and revisiting them often means writing small console projects. To save time and stay organized, I keep everything in one structured place.

🤝 I’m open to collaboration!

📦 This repository is my personal experience vault, which will continue to grow. New examples, ideas, and practices appear as I learn and work on real projects.

Small for now 🌱 but growing with each step toward something greater 🌳!

.NET

Note: Tests containing spin or yield may fail depending on the CPU.

📦 Archives

Zip

1. Create 1 root file
2. Create N root files
3. Create N folder files
4. Create Word doc

🔀 Threads

1. Fundamentals

1. Create, Sleep, Join
2. Create with arg
3. Foreground
4. Background
5. Info, current thread instance
6. Is alive
7. Join with timeout
8. Abort
9. Affinity (run parameter)
10. Affinity (programmatically)
11. Suspend, Resume
12. Suspend, Resume: Tick Tock
13. Abort in Core via CancellationTokenSource
14. Suspend-Resume in Core via ManualResetEventSlim
15. Tick Tock in Core

2. Synchronization

1. lock()
2. Monitor.Enter - Monitor.Exit
3. Wait Queue
4. Monitor.PulseAll
5. Monitor.Pulse
6. Tick Tock via Monitor.Pulse - Monitor.Wait
7. Monitor.Wait with timeout as Sleep
8. SpinLock vs lock()
9. Spin lock as Sleep
10. Spin lock for fast logging
11. Spin lock throwing SynchronizationLockException
12. Thread.Yield: fast cycle
13. Thread.SpinWait: fast cycle
14. SpinWait.SpinOnce
15. SpinWait.SpinUntil
16. Semaphore.WaitOne - Release
17. Semaphore.Release max slots
18. Semaphore: named for processes
19. Semaphore: named created new
20. Mutex as Monitor
21. Mutex for singleton thread
22. Mutex for singleton app
23. Interrupt
24. Deadlock: recursive locking
25. Deadlock: mutual waiting, break by Interrupt
26. Deadlock: mutual waiting, break by Join with timeout

3. Event Synchronization

1. EventWaitHandle.Set
2. EventWaitHandle.Reset
3. EventWaitHandle.Set with auto-reset
4. AutoResetEvent.Set
5. ManualResetEvent.Set
6. ManualResetEventSlim.Set
7. ManualResetEventSlim.Wait with timeout
8. CountdownEvent.Wait as Join
9. CountdownEvent.AddCount
10. CountdownEvent.TryAddCount
11. CountdownEvent.IsSet
12. CountdownEvent.Reset
13. CountdownEvent.Reset with arg
14. Barrier: Phases
15. CancellationToken: create token
16. CancellationToken: cancellation request
17. CancellationToken: cancellation callback sequence
18. CancellationToken: cancellation callback sequence: before first exception
19. CancellationToken: cancellation callback sequence: all, ignoring exceptions
20. CancellationToken.ThrowIfCancellationRequested
21. CancellationToken.None usage
22. CancellationToken.None variants
23. CancellationTokenSource.CreateLinkedTokenSource

4. Thread Pool

1. QueueUserWorkItem
2. QueueUserWorkItem with state
3. QueueUserWorkItem Join
4. Set pool thread as foreground
5. Pool restores thread as background

Atomic Operations

1. Volatile class
2. Volatile keyword
3. Interlocked Increment

Features

1. Synchronized method: instance
2. Synchronized method: static
3. Synchronized method: instance in different threads
4. Synchronized method: static in different threads
5. ThreadLocal<T>: counters
6. Lazy<T>: lazy initialization
7. Lazy<T>: single initialization
8. Lazy<T>: multiple initialization
9. Lazy<T>: unsafe initialization
10. Note: disposable sync primitives

📋 Tasks

1. Fundamentals

1. Create task
2. Task is in pool thread
3. Wait task
4. Wait task with timeout
5. Task is running after wait timeout
6. Wait task with cancellation token
7. Wait blocks thread
8. Wait wraps task exception into AggregateException
9. Result
10. Result blocks thread
11. Result wraps task exception into AggregateException
12. Delay
13. Delay with cancellation token
14. Delay is working after wait timeout
15. await releases manual thread
16. await releases pool thread
17. Method with async, without await is synchronous
18. Method with async, with await is asynchronous
19. ConfigureAwait
20. ConfigureAwait: effect on default sync context Post and Send
21. ConfigureAwait: effect on UI sync context Post and Send
22. Throwing task exception
23. ContinueWith: created task status
24. ContinueWith: task chain
25. ContinueWith: variable continuation
26. ContinueWith: continuation options
27. ContinueWith: SetInterval(
28. RunSynchronously
29. RunSynchronously and continuation
30. RunSynchronously and synchronous continuation
31. RunSynchronously continuation
32. Set status to TaskStatus.Canceled after cancellation by Token.ThrowIfCancellationRequested()
33. WhenAll
34. WhenAll: task exceptions
35. WhenAll with canceled task
36. WhenAll with incorrect canceled task
37. WaitAll
38. WaitAll: task exceptions
39. WhenAny
40. WhenAny: timeout
41. WhenAny: task exception
42. WaitAny
43. WaitAny: task exception
44. WhenEach
45. Yield
46. Awaiter: GetResult
47. Awaiter: OnCompleted
48. Awaiter: pattern
49. Awaiter: timespan awaiter
50. TaskCompletionSource: timeout
51. TaskCompletionSource: WithTimeout() extension
52. TaskCompletionSource: external event source adapter
53. FromResult
54. FromCanceled
55. FromException
56. CompletedTask
57. ValueTask: cached result
58. Factory
59. Factory: continuations
60. Factory: TaskCreationOptions.LongRunning
61. Factory: child task attachment, TaskCreationOptions.DenyChildAttach
62. Factory: set task schedulers

2. Synchronization

1. lock within task
2. Task within lock
3. Lock via semaphore

Features

1. Timer: Callback
2. Timer: AutoReset: false
3. Timer: Alarms
4. Parallel: For()
5. Parallel: Stop()
6. Parallel: Break()
7. Parallel: Local Var
8. Parallel: Exception
9. Parallel: ParallelOptions
10. Parallel: State Checks
11. Parallel: Foreach()
12. Parallel: Invoke()

🔗 LINQ

Expressions

1. Tree structure: view
2. Tree structure: create: left operand via Expression.MakeMemberAccess
3. Tree structure: create: left operand via Expression.Property
4. Tree structure: create: 3 levels
5. Lambda: create Func1
6. Lambda: create Func2
7. Lambda: parameter order
8. Lambda: info
9. Lambda: view with named parameters
10. Lambda: typed vs untyped
11. Lambda: DynamicInvoke(): dynamic Func
12. Lambda: DynamicInvoke(): dynamic Add
13. ExpressionType: list of all
14. Debug view
15. Debug view: lambda
16. Reduce()
17. ReduceAndCheck(): reducible
18. ReduceAndCheck(): not reducible
19. ReduceAndCheck(): prevent return null and this
20. ReduceExtensions(): builtin root
21. ReduceExtensions(): custom root: reducible
22. ReduceExtensions(): custom root: not reducible
23. IsByRef: struct parameter: with ref modifier
24. IsByRef: reference parameter: without ref modifier
25. IsByRef: reference parameter: with ref modifier
26. Visitor: root
27. Visitor: tree: immutable
28. Visitor: tree: with mutable child node
29. Expression.Invoke
30. Expression.Call: instance method
31. Expression.Call: static method
32. Expression.New
33. Expression.MemberInit, Expression.Bind
34. Expression.MemberBind
35. Expression.Quote: lambda returns lambda
36. Expression.Quote: lambda returns lambda: in DB provider
37. Expression.Assign
38. Expression.Block, Expression.Variable: Swap(x, y)
39. Expression.Block returns last expression result
40. Conditional operators
41. Expression.Throw
42. Expression.Goto, Expression.Label: empty
43. Expression.Goto, Expression.Label: instruction
44. Expression.Goto, Expression.Label: return value
45. Expression.Return like Expression.Goto
46. Expression.Return vs Expression.Goto: semantic difference
47. Expression.Return vs Expression.Goto: call via kind
48. Expression.Loop, Expression.Break: power to 10
49. Expression.Loop, Expression.Break: select even
50. GotoExpressionKind: list of all
51. Expression.TryCatchFinally
52. Reverse Polish Notation
53. Auto-mapper
54. SQL generation

Methods

1. Enumerable and Queryable method names
2. Enumerable.Range()
3. Enumerable.Repeat()
4. Enumerable.Empty()
5. Aggregate()
6. AggregateBy()
7. All()
8. Any()
9. All with Any()
10. Any with All()
11. Append()
12. Average()
13. Cast(): numbers
14. Cast(): classes
15. Chunk()
16. Concat()
17. Contains()
18. Count()
19. CountBy()
20. DefaultIfEmpty()
21. Distinct()
22. DistinctBy()
23. ElementAt()
24. ElementAtOrDefault()
25. Except()
26. ExceptBy()
27. First()
28. FirstOrDefault()
29. GroupBy()
30. GroupBy(): element selector
31. GroupBy(): result selector
32. GroupJoin()
33. Index()
34. Intersect()
35. IntersectBy()
36. Join()
37. Last()
38. LastOrDefault()
39. Max()
40. Max(): exceptions
41. MaxBy()
42. MaxBy(): exceptions
43. OfType()
44. Order()
45. OrderBy()
46. OrderDescending()
47. OrderByDescending()
48. Prepend()
49. Reverse()
50. Select(): indexing
51. SelectMany()
52. SequenceEqual()
53. Single()
54. SingleOrDefault()
55. Skip()
56. SkipLast()
57. SkipWhile()
58. Sum()
59. Take()
60. TakeLast()
61. TakeWhile()
62. ThenBy()
63. ThenByDescending()
64. ToDictionary()
65. ToLookup()
66. TryGetNonEnumeratedCount()
67. Union()
68. UnionBy()
69. Zip()

C++

🧱 Fundamentals

Introduction

1. Hello, World; std:cout <<
2. std::endl as arg
3. std::endl as function
4. std::ends
5. std::cin.get
6. std::getline
7. std::cin >>
8. string constructors
9. string item accessors: [], at()
10. #pragma once
11. Get type name
12. Pointer
13. Pointer arg
14. nullptr
15. Operator ->