# \$1indexOfArray
<a name="indexOfArray"></a>

The `$indexOfArray` operator in Amazon DocumentDB is used to find the index of the first occurrence of a specified element in an array. This operator returns the zero-based index position of the first element in the array that matches the specified value. If the value is not found, it returns -1.

**Parameters**
+ `array`: The array to search.
+ `value`: The value to search for in the array.
+ `start`: (optional) The position in the array to start the search from. The default value is 0.

## Example (MongoDB Shell)
<a name="indexOfArray-examples"></a>

The following example demonstrates how to use the \$1indexOfArray operator to find the index of the first occurrence of the element "mango" in the "fruits" array for each document.

**Create sample documents**

```
db.collection.insertMany([
  { _id: 1, fruits: ["apple", "banana", "cherry", "durian"] },
  { _id: 2, fruits: ["mango", "orange", "pineapple"] },
  { _id: 3, fruits: ["kiwi", "lemon", "mango"] }
]);
```

**Query example**

```
db.collection.aggregate([
  {
    $project: {
      _id: 1,
      fruitIndex: { $indexOfArray: ["$fruits", "mango"] }
    }
  }
]);
```

**Output**

```
{ "_id" : 1, "fruitIndex" : 1 }
{ "_id" : 2, "fruitIndex" : 0 }
{ "_id" : 3, "fruitIndex" : 2 }
```

## Code examples
<a name="indexOfArray-code"></a>

To view a code example for using the `$indexOfArray` 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('collection');

  const result = await collection.aggregate([
    {
      $project: {
        _id: 1,
        fruitIndex: { $indexOfArray: ["$fruits", "mango"] }
      }
    }
  ]).toArray();

  console.log(result);
  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['collection']

    result = list(collection.aggregate([
        {
            '$project': {
                '_id': 1,
                'fruitIndex': { '$indexOfArray': ["$fruits", "mango"] }
            }
        }
    ]))

    print(result)
    client.close()

example()
```

------