Brandon Lucas
0b5abece5f
Standard examples (examples/standard/): - hello_world: Basic effect usage - fizzbuzz: Classic programming exercise - factorial: Recursive and tail-recursive versions - primes: Prime number generation - guessing_game: Interactive Random + Console effects - stdlib_demo: Demonstrates List, String, Option, Math modules Showcase examples (examples/showcase/): - ask_pattern: Resumable effects for config/environment - custom_logging: Custom effect with handler - early_return: Fail effect for clean error handling - effect_composition: Combining multiple effects - higher_order: Closures and function composition - pattern_matching: ADTs and exhaustive matching Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
45 lines
996 B
Plaintext
45 lines
996 B
Plaintext
// Custom Logging with Effects
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//
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// This demonstrates how effects let you abstract side effects.
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// The same code can be run with different logging implementations.
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//
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// Expected output:
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// [INFO] Starting computation
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// [DEBUG] x = 10
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// [INFO] Processing
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// [DEBUG] result = 20
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// Final: 20
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effect Log {
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fn info(msg: String): Unit
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fn debug(msg: String): Unit
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}
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fn computation(): Int with {Log} = {
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Log.info("Starting computation")
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let x = 10
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Log.debug("x = " + toString(x))
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Log.info("Processing")
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let result = x * 2
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Log.debug("result = " + toString(result))
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result
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}
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handler consoleLogger: Log {
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fn info(msg) = {
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Console.print("[INFO] " + msg)
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resume(())
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}
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fn debug(msg) = {
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Console.print("[DEBUG] " + msg)
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resume(())
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}
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}
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fn main(): Unit with {Console} = {
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let result = run computation() with { Log = consoleLogger }
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Console.print("Final: " + toString(result))
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}
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let output = run main() with {}
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