System

Talk to the machine your program runs on: time, randomness, logging, tests, child processes, and command-line arguments.

• RandomRepeatable random numbers for tests, games, and shuffling.API
• DateTimeDates, times, time zones, durations, and stopwatches.API
• LoggingRecord events with named loggers, levels, and handlers.API
• TestingWrite @test functions with assertions.API
• DebugInspect memory use while developing.
• ProcessLaunch and talk to child processes.API
• CLI argumentsDefine commands and parse command-line arguments.API
• Application utilitiesUUIDs, CSV, configuration files, and temporary resources.
• Raw sockets and compressionTCP and UDP sockets, plus gzip and deflate streams.API
• Windows and game inputOpen a window or use a browser canvas, then read keyboard, mouse and gamepad input once per frame.API
• Audio playback and FFTPlay audio, select outputs, and inspect PCM and frequency data.API