Created
July 25, 2019 18:25
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Javascript async iterators to fetch data from paginated REST api.
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async function pageRequest(params) { | |
if (params.start >= 100) { | |
return Promise.resolve({ | |
start: params.start, | |
limit: 25, | |
isEndOfData: true | |
}); | |
} else { | |
return Promise.resolve({ | |
start: params.start, | |
limit: 25, | |
isEndOfData: false | |
}); | |
} | |
}; | |
let pageIterator = { | |
[Symbol.asyncIterator]: () => { | |
return { | |
offset: 0, | |
finished: false, | |
async next() { | |
if (!this.finished) { | |
let response = await pageRequest({ start: this.offset }); | |
this.finished = response.isEndOfData; | |
this.offset += response.limit; | |
return Promise.resolve({ | |
value: response, | |
done: false | |
}); | |
} else { | |
this.offset = 0; | |
this.finished = false; | |
return Promise.resolve({ | |
done: true | |
}); | |
} | |
} | |
} | |
} | |
}; | |
(async() => { | |
for await (const item of pageIterator) { | |
console.log(item); | |
} | |
})(); |
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