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$toDouble

New from version 4.0

The $toDouble operator in Amazon DocumentDB is used to convert a value to a double-precision 64-bit floating-point number. This can be useful when you need to perform arithmetic operations on values that are not originally in a numeric format.

Parameters

<expression>: The expression to convert to a double value. This can be any valid expression that resolves to a numeric, string, or boolean value.

Example (MongoDB Shell)

This example demonstrates how to use the $toDouble operator to convert a string value to a numeric value for the purpose of performing a mathematical calculation.

Create sample documents

db.numbers.insertMany([
  { _id: 1, value: "10.5" },
  { _id: 2, value: "20.25" },
  { _id: 3, value: "7" }
])

Query example

db.numbers.aggregate([
  {
    $project: {
      _id: 1,
      value: 1,
      double_value: { $toDouble: "$value" },
      double_plus_five: { $add: [{ $toDouble: "$value" }, 5] }
    }
  }
])

Output

[
  { "_id" : 1, "value" : "10.5", "double_value" : 10.5, "double_plus_five" : 15.5 },
  { "_id" : 2, "value" : "20.25", "double_value" : 20.25, "double_plus_five" : 25.25 },
  { "_id" : 3, "value" : "7", "double_value" : 7.0, "double_plus_five" : 12.0 }
]

Code examples

To view a code example for using the $toDouble command, choose the tab for the language that you want to use:

Node.js

const { MongoClient } = require('mongodb');

async function example() {
  const client = await MongoClient.connect('mongodb://<username>:<password>@<cluster-endpoint>:27017/?tls=true&tlsCAFile=global-bundle.pem&replicaSet=rs0&readPreference=secondaryPreferred&retryWrites=false');
  const db = client.db('test');
  const collection = db.collection('numbers');

  const result = await collection.aggregate([
    {
      $project: {
        _id: 1,
        value: 1,
        double_value: { $toDouble: "$value" },
        double_plus_five: { $add: [{ $toDouble: "$value" }, 5] }
      }
    }
  ]).toArray();

  console.log(result);
  await client.close();
}

example();

Python

from pymongo import MongoClient

def example():
    client = MongoClient('mongodb://<username>:<password>@<cluster-endpoint>:27017/?tls=true&tlsCAFile=global-bundle.pem&replicaSet=rs0&readPreference=secondaryPreferred&retryWrites=false')
    db = client['test']
    collection = db['numbers']

    result = list(collection.aggregate([
        {
            '$project': {
                '_id': 1,
                'value': 1,
                'double_value': { '$toDouble': '$value' },
                'double_plus_five': { '$add': [{ '$toDouble': '$value' }, 5] }
            }
        }
    ]))

    print(result)
    client.close()

example()