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Types 6 | 7 | ### Numbers 8 | - Integer types 9 | - Floating-point types 10 | - Literal constants for numbers 11 | - Numbers representation on the JVM 12 | - Explicit number conversions 13 | - Operations on numbers 14 | - Division of integers 15 | - Bitwise operations 16 | - Floating-point numbers comparison 17 | 18 | ### Unsigned integer types 19 | - Unsigned arrays and ranges 20 | - Unsigned integers literals 21 | - Use cases 22 | - Non-goals 23 | 24 | ### Booleans 25 | 26 | ### Characters 27 | 28 | ### Strings 29 | - String literals 30 | - Escaped strings 31 | - Multiline strings 32 | - String templates 33 | - String formatting 34 | 35 | ### Arrays 36 | - When to use arrays 37 | - Create arrays 38 | - Nested arrays 39 | - Access and modify elements 40 | - Work with arrays 41 | - Pass variable number of arguments to a function 42 | - Compare arrays 43 | - Transform arrays 44 | - Sum 45 | - Shuffle 46 | - Convert arrays to collections 47 | - Primitive-type arrays 48 | 49 | ### Type checks and casts 50 | - is and !is operators 51 | - Smart casts 52 | - "Unsafe" cast operator 53 | - "Safe" (nullable) cast operator 54 | 55 | --- 56 | 57 | ## 2. Control Flow 58 | 59 | ### Conditions and loops 60 | - If expression 61 | - When expression 62 | - For loops 63 | - While loops 64 | - Break and continue in loops 65 | 66 | ### Returns and jumps 67 | - Break and continue labels 68 | - Return to labels 69 | 70 | ### Exceptions 71 | - Exception classes 72 | - Try is an expression 73 | - Checked exceptions 74 | - The Nothing type 75 | - Java interoperability 76 | 77 | ### Packages and imports 78 | - Default imports 79 | - Imports 80 | - Visibility of top-level declarations 81 | 82 | --- 83 | 84 | ## 3. Functions 85 | 86 | ### Functions 87 | - Function usage 88 | - Parameters 89 | - Default arguments 90 | - Named arguments 91 | - Unit-returning functions 92 | - Single-expression functions 93 | - Explicit return types 94 | - Variable number of arguments (varargs) 95 | - Infix notation 96 | - Function scope 97 | - Local functions 98 | - Member functions 99 | - Generic functions 100 | - Tail recursive functions 101 | 102 | ### Lambdas 103 | - Higher-order functions and lambdas 104 | - Function types 105 | - Instantiating a function type 106 | - Invoking a function type instance 107 | - Inline functions 108 | - Lambda expressions and anonymous functions 109 | - Lambda expression syntax 110 | - Passing trailing lambdas 111 | - it: implicit name of a single parameter 112 | - Returning a value from a lambda expression 113 | - Underscore for unused variables 114 | - Destructuring in lambdas 115 | - Anonymous functions 116 | - Closures 117 | - Function literals with receiver 118 | 119 | ### Inline functions 120 | - noinline 121 | - Non-local returns 122 | - Reified type parameters 123 | - Inline properties 124 | - Restrictions for public API inline functions 125 | 126 | ### Operator overloading 127 | - Unary operations 128 | - Unary prefix operators 129 | - Increments and decrements 130 | - Binary operations 131 | - Arithmetic operators 132 | - in operator 133 | - Indexed access operator 134 | - invoke operator 135 | - Augmented assignments 136 | - Equality and inequality operators 137 | - Comparison operators 138 | - Property delegation operators 139 | - Infix calls for named functions 140 | 141 | ### Builders 142 | - Type-safe builders 143 | - How it works 144 | - Scope control: @DslMarker 145 | - Full definition of the com.example.html package 146 | - Using builders with builder type inference 147 | - Writing your own builders 148 | - Requirements for enabling builder inference 149 | - Supported features 150 | - How builder inference works 151 | - Postponed type variables 152 | - Contributing to builder inference results 153 | 154 | --- 155 | 156 | ## 4. Classes 157 | 158 | ### Basics 159 | - Constructors 160 | - Secondary constructors 161 | - Creating instances of classes 162 | - Class members 163 | - Inheritance 164 | - Abstract classes 165 | - Companion object 166 | 167 | ### Inheritance 168 | - Overriding methods 169 | - Overriding properties 170 | - Derived class initialization order 171 | - Calling the superclass implementation 172 | - Overriding rules 173 | 174 | ### Properties 175 | - Declaring properties 176 | - Getters and setters 177 | - Backing fields 178 | - Backing properties 179 | - Compile-time constants 180 | - Late-initialized properties and variables 181 | - Checking whether a lateinit var is initialized 182 | - Overriding properties 183 | - Delegated properties 184 | 185 | ### Interfaces 186 | - Implementing interfaces 187 | - Properties in interfaces 188 | - Interfaces Inheritance 189 | - Resolving overriding conflicts 190 | 191 | ### Functional (SAM) interfaces 192 | - SAM conversions 193 | - Migration from an interface with constructor function to a functional interface 194 | - Functional interfaces vs. type aliases 195 | 196 | ### Visibility modifiers 197 | - Packages 198 | - Class members 199 | - Constructors 200 | - Local declarations 201 | - Modules 202 | 203 | ### Extensions 204 | - Extension functions 205 | - Extensions are resolved statically 206 | - Nullable receiver 207 | - Extension properties 208 | - Companion object extensions 209 | - Scope of extensions 210 | - Declaring extensions as members 211 | - Note on visibility 212 | 213 | ### Data classes 214 | - Properties declared in the class body 215 | - Copying 216 | - Data classes and destructuring declarations 217 | - Standard data classes 218 | 219 | ### Sealed classes and interfaces 220 | - Location of direct subclasses 221 | - Inheritance in multiplatform projects 222 | - Sealed classes and when expression 223 | 224 | ### Generics: in, out, where 225 | - Variance 226 | - Declaration-site variance 227 | - Type projections 228 | - Use-site variance: type projections 229 | - Star-projections 230 | - Generic functions 231 | - Generic constraints 232 | - Upper bounds 233 | - Definitely non-nullable types 234 | - Type erasure 235 | - Generics type checks and casts 236 | - Unchecked casts 237 | - Underscore operator for type arguments 238 | 239 | ### Nested and inner classes 240 | - Inner classes 241 | - Anonymous inner classes 242 | 243 | ### Enum classes 244 | - Anonymous classes 245 | - Implementing interfaces in enum classes 246 | - Working with enum constants 247 | 248 | ### Inline value classes 249 | - Members 250 | - Inheritance 251 | - Representation 252 | - Mangling 253 | - Calling from Java code 254 | - Inline classes vs type aliases 255 | - Inline classes and delegation 256 | 257 | ### Object expressions and declarations 258 | - Object expressions 259 | - Creating anonymous objects from scratch 260 | - Inheriting anonymous objects from supertypes 261 | - Using anonymous objects as return and value types 262 | - Accessing variables from anonymous objects 263 | - Object declarations 264 | - Data objects 265 | - Companion objects 266 | - Semantic difference between object expressions and declarations 267 | 268 | ### Delegation 269 | - Overriding a member of an interface implemented by delegation 270 | 271 | ### Delegated properties 272 | - Standard delegates 273 | - Lazy properties 274 | - Observable properties 275 | - Delegating to another property 276 | - Storing properties in a map 277 | - Local delegated properties 278 | - Property delegate requirements 279 | - Translation rules for delegated properties 280 | - Optimized cases for delegated properties 281 | - Translation rules when delegating to another property 282 | - Providing a delegate 283 | 284 | ### Type aliases 285 | 286 | --- 287 | 288 | ## 5. Null safety 289 | - Nullable types and non-nullable types 290 | - Checking for null in conditions 291 | - Safe calls 292 | - Nullable receiver 293 | - Elvis operator 294 | - The !! operator 295 | - Safe casts 296 | - Collections of a nullable type 297 | 298 | --- 299 | 300 | ## 6. Equality 301 | - Structural equality 302 | - Referential equality 303 | - Floating-point numbers equality 304 | - Array equality 305 | 306 | --- 307 | 308 | ## 7. This expressions 309 | - Qualified this 310 | - Implicit this 311 | 312 | --- 313 | 314 | ## 8. Scope functions 315 | - Function selection 316 | - Distinctions 317 | - Context object: this or it 318 | - Return value 319 | - Functions 320 | - let 321 | - with 322 | - run 323 | - apply 324 | - also 325 | - takeIf and takeUnless 326 | 327 | --- 328 | 329 | ## 9. Destructuring declarations 330 | - Example: returning two values from a function 331 | - Example: destructuring declarations and maps 332 | - Underscore for unused variables 333 | - Destructuring in lambdas 334 | 335 | --- 336 | 337 | ## 10. Reflection 338 | - JVM dependency 339 | - Class references 340 | - Bound class references 341 | - Callable references 342 | - Function references 343 | - Property references 344 | - Interoperability with Java reflection 345 | - Constructor references 346 | - Bound function and property references 347 | - Bound constructor references 348 | 349 | --- 350 | 351 | ## 11. Time measurement 352 | - Calculate duration 353 | - Create duration 354 | - Get string representation 355 | - Convert duration 356 | - Compare duration 357 | - Break duration into components 358 | - Measure time 359 | - Measure code execution time 360 | - Mark moments in time 361 | - Measure differences in time 362 | - Time sources 363 | - Default time sources per platform 364 | - Create time source 365 | 366 | --- 367 | 368 | ## 12. Collections 369 | - Collection types 370 | - Collection 371 | - List 372 | - Set 373 | - Map 374 | - ArrayDeque 375 | 376 | --- 377 | 378 | ## 13. Opt-in requirements 379 | - Opt in to using API 380 | - Propagating opt-in 381 | - Non-propagating opt-in 382 | - Require opt-in for API 383 | - Create opt-in requirement annotations 384 | - Mark API elements 385 | - Opt-in requirements for pre-stable APIs 386 | 387 | --- 388 | 389 | ## 14. Annotations 390 | - Usage 391 | - Constructors 392 | - Instantiation 393 | - Lambdas 394 | - Annotation use-site targets 395 | - Java annotations 396 | - Arrays as annotation parameters 397 | - Accessing properties of an annotation instance 398 | - Ability to not generate JVM 1.8+ annotation targets 399 | - Repeatable annotations 400 | 401 | --- 402 | 403 | ## 15. Asynchronous programming techniques 404 | - Threading 405 | - Callbacks 406 | - Futures, promises, and others 407 | - Reactive extensions 408 | - CoRoutines 409 | 410 | --- 411 | 412 | ## 16. Collections bi' tık Advance a.k.a E.H. 413 | ### Constructing collections 414 | - Construct from elements 415 | - Create with collection builder functions 416 | - Empty collections 417 | - Initializer functions for lists 418 | - Concrete type constructors 419 | - Copy 420 | - Invoke functions on other collections 421 | 422 | ### Iterators 423 | - List iterators 424 | - Mutable iterators 425 | 426 | ### Ranges and progressions 427 | - Progression 428 | 429 | ### Sequences 430 | - Construct 431 | - From elements 432 | - From an Iterable 433 | - From a function 434 | - From chunks 435 | - Sequence operations 436 | - Sequence processing example 437 | - Iterable 438 | - Sequence 439 | 440 | ### Collection operations overview 441 | - Extension and member functions 442 | - Common operations 443 | - Write operations 444 | 445 | ### Collection transformation operations 446 | - Map 447 | - Zip 448 | - Associate 449 | - Flatten 450 | - String representation 451 | 452 | ### Filtering collections 453 | - Filter by predicate 454 | - Partition 455 | - Test predicates 456 | 457 | ### Plus and minus operators 458 | 459 | ### Grouping 460 | 461 | ### Retrieve collection parts 462 | - Slice 463 | - Take and drop 464 | - Chunked 465 | - Windowed 466 | 467 | ### Retrieve single elements 468 | - Retrieve by position 469 | - Retrieve by condition 470 | - Retrieve with selector 471 | - Random element 472 | - Check element existence 473 | 474 | ### Ordering 475 | - Natural order 476 | - Custom orders 477 | - Reverse order 478 | - Random order 479 | 480 | ### Aggregate operations 481 | - Fold and reduce 482 | 483 | ### Collection write operations 484 | - Adding elements 485 | - Removing elements 486 | - Updating elements 487 | 488 | ### List-specific operations 489 | - Retrieve elements by index 490 | - Retrieve list parts 491 | - Find element positions 492 | - Linear search 493 | - Binary search in sorted lists 494 | - List write operations 495 | - Add 496 | - Update 497 | - Remove 498 | - Sort 499 | 500 | ### Set-specific operations 501 | 502 | ### Map-specific operations 503 | - Retrieve keys and values 504 | - Filter 505 | - Plus and minus operators 506 | - Map write operations 507 | - Add and update entries 508 | - Remove entries 509 | 510 | --- 511 | 512 | ## 17. CoRoutines bi' tık Advance a.k.a E.H. 513 | ### Basics 514 | - Your first coroutine 515 | - Structured concurrency 516 | - Extract function refactoring 517 | - Scope builder 518 | - Scope builder and concurrency 519 | - An explicit job 520 | - Coroutines are light-weight 521 | 522 | ### Shared mutable state and concurrency 523 | - The problem 524 | - Volatiles are of no help 525 | - Thread-safe data structures 526 | - Thread confinement fine-grained 527 | - Thread confinement coarse-grained 528 | - Mutual exclusion 529 | 530 | ### Cancellation and timeouts 531 | - Cancelling coroutine execution 532 | - Cancellation is cooperative 533 | - Making computation code cancellable 534 | - Closing resources with finally 535 | - Run non-cancellable block 536 | - Timeout 537 | - Asynchronous timeout and resources 538 | 539 | ### Composing suspending functions 540 | - Sequential by default 541 | - Concurrent using async 542 | - Lazily started async 543 | - Async-style functions 544 | - Structured concurrency with async 545 | 546 | ### Coroutine context and dispatchers 547 | - Dispatchers and threads 548 | - Unconfined vs confined dispatcher 549 | - Debugging coroutines and threads 550 | - Debugging with IDEA 551 | - Debugging using logging 552 | - Jumping between threads 553 | - Job in the context 554 | - Children of a coroutine 555 | - Parental responsibilities 556 | - Naming coroutines for debugging 557 | - Combining context elements 558 | - Coroutine scope 559 | - Thread-local data 560 | 561 | ### Asynchronous Flow 562 | - Representing multiple values 563 | - Sequences 564 | - Suspending functions 565 | - Flows 566 | - Flows are cold 567 | - Flow cancellation basics 568 | - Flow builders 569 | - Intermediate flow operators 570 | - Transform operator 571 | - Size-limiting operators 572 | - Terminal flow operators 573 | - Flows are sequential 574 | - Flow context 575 | - A common pitfall when using withContext 576 | - flowOn operator 577 | - Buffering 578 | - Conflation 579 | - Processing the latest value 580 | - Composing multiple flows 581 | - Zip 582 | - Combine 583 | - Flattening flows 584 | - flatMapConcat 585 | - flatMapMerge 586 | - flatMapLatest 587 | - Flow exceptions 588 | - Collector try and catch 589 | - Everything is caught 590 | - Exception transparency 591 | - Transparent catch 592 | - Catching declaratively 593 | - Flow completion 594 | - Imperative finally block 595 | - Declarative handling 596 | - Successful completion 597 | - Imperative versus declarative 598 | - Launching flow 599 | - Flow cancellation checks 600 | - Flow and Reactive Streams 601 | 602 | ### Channels 603 | - Channel basics 604 | - Closing and iteration over channels 605 | - Building channel producers 606 | - Pipelines 607 | - Prime numbers with pipeline 608 | - Fan-out 609 | - Fan-in 610 | - Buffered channels 611 | - Channels are fair 612 | - Ticker channels 613 | 614 | ### Coroutine exceptions handling 615 | - Exception propagation 616 | - CoroutineExceptionHandler 617 | - Cancellation and exceptions 618 | - Exceptions aggregation 619 | - Supervision 620 | - Supervision job 621 | - Supervision scope 622 | --------------------------------------------------------------------------------