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Either::Right($n) : Either::Left(\"Too small\"))\n    -\u003eeither(fn($err) =\u003e \"Error: $err\", fn($val) =\u003e \"Value: $val\");\n```\n\n### ImmutableList\n\nImmutable linked list (PDS).\n\n```php\n\u003c?php\n\nuse Phonad\\Core\\Data\\ImmutableList;\n\n$list = ImmutableList::from([1, 2, 3])\n    -\u003econs(0)\n    -\u003efilter(fn($n) =\u003e $n \u003e 0); // [1, 2, 3]\n```\n\n## Effects\n\n### Reader\n\nDependency injection via environment.\n\n```php\n\u003c?php\n\nuse Phonad\\Core\\Effect\\Reader;\n\n$logic = Reader::ask()-\u003emap(fn($env) =\u003e \"Env is: \" . $env['mode']);\necho $logic-\u003erun(['mode' =\u003e 'production']);\n```\n\n### Writer\n\nPure logging alongside values.\n\n```php\n\u003c?php\n\nuse Phonad\\Core\\Effect\\Writer;\n\n[$val, $logs] = Writer::of(10)\n    -\u003eflatMap(fn($n) =\u003e Writer::of($n + 1, [\"Incremented\"]))\n    -\u003erun();\n```\n\n### IO\n\nLazy side effects.\n\n```php\n\u003c?php\n\nuse Phonad\\Core\\Effect\\IO;\n\n// Wrap the effect into the `IO` monad\n$sayHello = fn(string $name) =\u003e IO::make(function () use ($name) {\n    echo \"Hello, $name!\";\n});\n\n// Chain the logic (nothing actually happens yet)\n$program = IO::of('world')\n    -\u003emap('strtoupper')\n    -\u003eflatMap(fn($name) =\u003e $sayHello($name));\n\n// FIRE!\n$program-\u003erun();  // Outputs: Hello, WORLD!\n```\n\n## License\n\nMIT\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fatomicptr%2Fphonad","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fatomicptr%2Fphonad","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fatomicptr%2Fphonad/lists"}