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"readme": "# zen-observable\n\nAn implementation of Observables for JavaScript. Requires Promises or a Promise polyfill.\n\n## Install\n\n```sh\nnpm install zen-observable\n```\n\n## Usage\n\n```js\nimport Observable from 'zen-observable';\n\nObservable.of(1, 2, 3).subscribe(x => console.log(x));\n```\n\n## API\n\n### new Observable(subscribe)\n\n```js\nlet observable = new Observable(observer => {\n // Emit a single value after 1 second\n let timer = setTimeout(() => {\n observer.next('hello');\n observer.complete();\n }, 1000);\n\n // On unsubscription, cancel the timer\n return () => clearTimeout(timer);\n});\n```\n\nCreates a new Observable object using the specified subscriber function. The subscriber function is called whenever the `subscribe` method of the observable object is invoked. The subscriber function is passed an *observer* object which has the following methods:\n\n- `next(value)` Sends the next value in the sequence.\n- `error(exception)` Terminates the sequence with an exception.\n- `complete()` Terminates the sequence successfully.\n- `closed` A boolean property whose value is `true` if the observer's subscription is closed.\n\nThe subscriber function can optionally return either a cleanup function or a subscription object. If it returns a cleanup function, that function will be called when the subscription has closed. If it returns a subscription object, then the subscription's `unsubscribe` method will be invoked when the subscription has closed.\n\n### Observable.of(...items)\n\n```js\n// Logs 1, 2, 3\nObservable.of(1, 2, 3).subscribe(x => {\n console.log(x);\n});\n```\n\nReturns an observable which will emit each supplied argument.\n\n### Observable.from(value)\n\n```js\nlet list = [1, 2, 3];\n\n// Iterate over an object\nObservable.from(list).subscribe(x => {\n console.log(x);\n});\n```\n\n```js\n// Convert something 'observable' to an Observable instance\nObservable.from(otherObservable).subscribe(x => {\n console.log(x);\n});\n```\n\nConverts `value` to an Observable.\n\n- If `value` is an implementation of Observable, then it is converted to an instance of Observable as defined by this library.\n- Otherwise, it is converted to an Observable which synchronously iterates over `value`.\n\n### observable.subscribe([observer])\n\n```js\nlet subscription = observable.subscribe({\n next(x) { console.log(x) },\n error(err) { console.log(`Finished with error: ${ err }`) },\n complete() { console.log('Finished') }\n});\n```\n\nSubscribes to the observable. Observer objects may have any of the following methods:\n\n- `next(value)` Receives the next value of the sequence.\n- `error(exception)` Receives the terminating error of the sequence.\n- `complete()` Called when the stream has completed successfully.\n\nReturns a subscription object that can be used to cancel the stream.\n\n### observable.subscribe(nextCallback[, errorCallback, completeCallback])\n\n```js\nlet subscription = observable.subscribe(\n x => console.log(x),\n err => console.log(`Finished with error: ${ err }`),\n () => console.log('Finished')\n);\n```\n\nSubscribes to the observable with callback functions. Returns a subscription object that can be used to cancel the stream.\n\n### observable.forEach(callback)\n\n```js\nobservable.forEach(x => {\n console.log(`Received value: ${ x }`);\n}).then(() => {\n console.log('Finished successfully')\n}).catch(err => {\n console.log(`Finished with error: ${ err }`);\n})\n```\n\nSubscribes to the observable and returns a Promise for the completion value of the stream. The `callback` argument is called once for each value in the stream.\n\n### observable.filter(callback)\n\n```js\nObservable.of(1, 2, 3).filter(value => {\n return value > 2;\n}).subscribe(value => {\n console.log(value);\n});\n// 3\n```\n\nReturns a new Observable that emits all values which pass the test implemented by the `callback` argument.\n\n### observable.map(callback)\n\nReturns a new Observable that emits the results of calling the `callback` argument for every value in the stream.\n\n```js\nObservable.of(1, 2, 3).map(value => {\n return value * 2;\n}).subscribe(value => {\n console.log(value);\n});\n// 2\n// 4\n// 6\n```\n\n### observable.reduce(callback [,initialValue])\n\n```js\nObservable.of(0, 1, 2, 3, 4).reduce((previousValue, currentValue) => {\n return previousValue + currentValue;\n}).subscribe(result => {\n console.log(result);\n});\n// 10\n```\n\nReturns a new Observable that applies a function against an accumulator and each value of the stream to reduce it to a single value.\n\n### observable.concat(...sources)\n\n```js\nObservable.of(1, 2, 3).concat(\n Observable.of(4, 5, 6),\n Observable.of(7, 8, 9)\n).subscribe(result => {\n console.log(result);\n});\n// 1, 2, 3, 4, 5, 6, 7, 8, 9\n```\n\nMerges the current observable with additional observables.\n",
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