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reading","robots_txt_status":"success","robots_txt_updated_at":"2025-07-24T06:49:26.215Z","robots_txt_url":"https://github.com/robots.txt","online":false,"can_crawl_api":true,"host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":[],"created_at":"2026-01-19T16:01:33.195Z","updated_at":"2026-01-19T16:01:37.055Z","avatar_url":"https://github.com/32bitkid.png","language":"JavaScript","funding_links":[],"categories":[],"sub_categories":[],"readme":"# kefir.handle\n\nAdapts the generic `withHandler(handler)` format to work more like the syntax `observe(observer)`.\n\n## Installation\n\n### NPM\n\n```\nnpm install kefir.handle\n```\n\n## Usage\n\n```js\nimport handle from 'kefir.handle';\n\nstream.withHandler(handle({\n  value(emitter, value, event) { /* ...do stuff... */ },\n  error(emitter, value, event) { /* ...do stuff... */ },\n  end(emitter, value, event)   { /* ...do stuff... */ },\n}));\n```\n\nA handler is an object with 3 optional methods:\n\n- `value` - called when the source observable emits a value\n- `error` - called when the source observable emits an error\n- `end` - called when the source observable has ended\n\nEach of these handlers are invoked with three arguments: an emitter, the value of the event, and an event object.\n\nPlease note, an `undefined` handler will _automatically_ re-emit events of that type:\n\n```js\nimport Kefir from 'kefir';\nimport handle from 'kefir.handle';\n\nvar source = Kefir.sequentially(100, [0, 1, 2, 3]);\nvar result = source .withHandler(handler());\n\nresult.log();\n```\n\n```\n\u003e [sequentially.withHandler] \u003cvalue\u003e 1\n\u003e [sequentially.withHandler] \u003cvalue\u003e 2\n\u003e [sequentially.withHandler] \u003cvalue\u003e 3\n\u003e [sequentially.withHandler] \u003cend\u003e\n```\n\n```\nsource:  ---0---1---2---3X\nresult:  ---•---•---•---•X\n            0   1   2   3\n```\n\n\nThis is _the opposite_ of the way that `Kefir.withHandler()` works. If you _want_ to discard events, you can use the exported `throwaway` helper:\n\n```js\nimport handle, { throwaway } from 'kefir.handle';\n\nstream.withHandler(handle({\n  value: throwaway,\n  error: throwaway,\n  end:   throwaway,\n}));\n```\n\nConverting the [`withHandler()`](https://rpominov.github.io/kefir/#with-handler) example from the [Kefir.js](https://rpominov.github.io/kefir/) documentation.\n\n```js\nimport Kefir from 'kefir';\nimport handle from 'kefir.handle';\n\nvar source = Kefir.sequentially(100, [0, 1, 2, 3]);\nvar result = source.withHandler(handle({\n    value(emitter, value) {\n      for (var i = 0; i \u003c value; i++) {\n        emitter.emit(value);\n      }\n    },\n    end(emitter) {\n      emitter.emit('bye');\n      emitter.end();\n    },\n  }));\n\nresult.log();\n```\n\n```\n\u003e [sequentially.withHandler] \u003cvalue\u003e 1\n\u003e [sequentially.withHandler] \u003cvalue\u003e 2\n\u003e [sequentially.withHandler] \u003cvalue\u003e 2\n\u003e [sequentially.withHandler] \u003cvalue\u003e 3\n\u003e [sequentially.withHandler] \u003cvalue\u003e 3\n\u003e [sequentially.withHandler] \u003cvalue\u003e 3\n\u003e [sequentially.withHandler] \u003cvalue\u003e bye\n\u003e [sequentially.withHandler] \u003cend\u003e\n```\n\n```\nsource:  ---0---1--- 2---  3 X\nresult:  -------•---••---••••X\n                1   22   333bye\n```\n\n### With ES7 `::` bind operator\n\n```\nimport { handle } from 'kefir.handle';\n\nvar source = Kefir.sequentially(100, [0, 1, 2, 3]);\nvar result = source::handle({\n  value(emitter) { /* value handler */ }\n})\n```\n\n\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2F32bitkid%2Fkefir.handle","html_url":"https://awesome.ecosyste.ms/projects/github.com%2F32bitkid%2Fkefir.handle","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2F32bitkid%2Fkefir.handle/lists"}