Kotlin: Function Literals with Receiver

A brief introduction to Function Literals with Receiver in Kotlin including what they are, how to use them and some examples.

This was a lightning talk from a Chicago Kotlin User Group meetup https://www.meetup.com/Chicago-Kotlin/events/260292217.

Transcript

1. Function Literals with Receiver Ryan Casler @ryanrampage1 github.com/ryanrampage1
2. Terms
3. Function Literal A function that is not declared, but passed immediately as an expression
4. Lambda A type of function literal using curly braces EX. val sum = { x: Int, y: Int -> x + y }
5. Receiver A class that is gaining a function
6. Fun Stuff
7. What Are They • A function • Can be passed into other functions • Can be a Lambda • Has access to the receivers members
8. Call sites can pass in a new function for any existing class
9. Receiver.(SomeArg) -> Unit
10. How to Use
11. Examples
12. Standard Library Apply
13. Standard Library With
14. Standard Library Run
15. Batch Light
16. Batch SQLite Insert Steps 1. Chunk the list 2. Create strings to represent SQL 3. Compile SQLite statements 4. Bind items to the statement 5. Execute the statement
18. Binding Items 1. Bind each item 2. Track the current Bind Index 3. Use the correct typed bind function for each value a. bindString, bindLong ect
19. Library Implementation
20. Call Site
21. Type Safe Builder
22. Kotlin HTML Builder
23. HTML Builder Implementation
24. Domain-Specific Language (DSL)
25. Sources • • • •