observable.js
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observable.js
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class Observable {↵
constructor(subscribe) {↵
this.subscribe = subscribe;↵
}↵
map(fn) {↵
return new Observable(obs =>↵
this.subscribe({↵
next: v => obs.next(fn(v)),↵
error: e => obs.error(e)↵
})↵
);↵
}↵
filter(fn) {↵
return new Observable(obs =>↵
this.subscribe({↵
next: v => fn(v) && obs.next(v)↵
})↵
);↵
}↵
}
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