34 lines
679 B
JavaScript
34 lines
679 B
JavaScript
'use strict'
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const MongoClient = require('mongodb').MongoClient
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const express = require('express')
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const app = express()
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var url = 'mongodb://localhost:27017/test';
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function sum (data) {
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var sum = 0
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const l = data.length
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for (var i = 0; i < l; i++) {
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sum += data[i].value
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}
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return sum
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}
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MongoClient.connect(url, function(err, db) {
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if (err) { throw err }
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const collection = db.collection('data')
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app.get('/hello', (req, res) => {
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collection.find({}).toArray(function (err, data) {
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if (err) {
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res.send(err)
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return
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}
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const result = sum(data) / data.length
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res.send('' + result)
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})
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})
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app.listen(3000)
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})
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