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nanoption\n\nTiny (220 bytes), zero dependency wrapper for nullable values.\n\n## TL;DR\n\n```js\n// With nanoption\nimport { Option } from 'nanoption'\n\nfunction getJwtToken(executionContext) {\n  const jwtToken = Option.of(executionContext)\n    .map(context =\u003e context.switchToHttp()) // context can have no http mod (e.g. WebSocket)\n    .map(httpMod =\u003e httpMod.getRequest())   // context can have no http request\n    .map(request =\u003e request.headers)        // request can have no headers\n    .map(headers =\u003e parseHeaders(headers))  // parseHeaders can return null\n    .map(jwtAuth =\u003e jwtAuth.split(' ')[1])  // auth header can contain only one part\n    .getOrElse('')\n\n  return jwtToken\n}\n\n// Without nanoption\nfunction getJwtToken(executionContext) {\n  const httpMod = executionContext.switchToHttp()\n  if (!httpMod) return ''  // context can have no http mod (e.g. WebSocket)\n\n  const request = httpMod.getRequest()\n  if (!request) return ''  // context can have no http request\n\n  const headers = request.headers\n  if (!headers) return ''  // request can have no headers\n\n  const jwtAuth = parseHeaders(headers)\n  if (!jwtAuth) return ''  // headers can have no auth header\n\n  const jwtToken = wtAuth.split(' ')[1]\n  if (!jwtToken) return '' // auth header can contain only one part\n  \n  return jwtAuth\n}\n```\n\n## Installation\n \n```sh\nyarn add nanoption\n```\n \nOr if you prefer `npm`:\n \n```sh\nnpm i nanoption\n```\n\n## Motivation\n\nIt JS in some cases we can get an error `Cannot do something of undefined/null`. This library explicitly works with nullable values and provide clear interface for it.\n\nAlso, library support TypeSciript as first-class citizen and do some checks in complie time. For example:\n```ts\nimport { Option } from 'nanoption'\n\n// #map\nOption.of(2).map(_ =\u003e _ * 2) // Some(4)\nOption.of().map(() =\u003e 2)     // None (known at compile time)\n\n// #get\nOption.of(3).get()           // 3\nOption.of().get()            // COMPILE ERROR! Can't call get() on None\n```\n\nOf course, you can use JavaScript without TypeScript, but it's not as fun.\n\nNow [Optional Chaining Proposal](https://github.com/tc39/proposal-optional-chaining) only on stage 1, but very useful. This library give ECMAScript-version independent alternative for it.\n\n## API\n\n```ts\nimport { Option } from 'nanoption'\n\n// Create an option\nOption.of(3)                                // Some(3)\nOption.of('abc')                            // Some('abc')\nOption.of(null)                             // None\nOption.of(undefined)                        // None\n\n// #map\nOption.of(2).map(_ =\u003e _ * 2)                // Some(4)\nOption.of().map(() =\u003e 2)                    // None\n\n// #flatMap\nOption.of(3).flatMap(_ =\u003e Option.of(_ * 2)) // Some(6)\nOption.of().flatMap(() =\u003e Option.of(2))     // None\n\n// #get\nOption.of(3).get()                          // 3\nOption.of().get()                           // throw Exception\n\n// #getOrElse\nOption.of(1).getOrElse(2)                   // 1\nOption.of(null).getOrElse(2)                // 2\n\n// #isEmpty\nOption.of(2).isEmpty()                      // false\nOption.of().isEmpty()                       // true\n\n// #nonEmpty\nOption.of(2).nonEmpty()                     // true\nOption.of().nonEmpty()                      // false\n\n// #toString\nOption.of(2).toString()                     // \"Some(2)\"\nOption.of().toString()                      // \"None\"\n```\n\n## Alternatives\n\n+ [tsoption](https://github.com/bcherny/tsoption) is [Fantasyland](https://github.com/fantasyland/fantasy-land)-compliant, but it requires 2-3 times more space.\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Figorkamyshev%2Fnanoption","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Figorkamyshev%2Fnanoption","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Figorkamyshev%2Fnanoption/lists"}