> ## Documentation Index
> Fetch the complete documentation index at: https://sensible.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Concatenate

Concatenates the output of two or more fields:

* If the fields' outputs are all strings, the output is a single string.
* If any field output is an array, the output is an array if the array lengths match. The output is a string if the array lengths are unequal (using the first element of each array).
* If a string output is present among arrays, Sensible repeats its value for every element of the output.

## Parameters

The following parameters are in the computed field's [global Method](/senseml-reference/computed-field-methods/index-computed-field-methods#parameters) parameter:

| key                        | value                                    | description                                                      |
| -------------------------- | ---------------------------------------- | ---------------------------------------------------------------- |
| id (**required**)          | concat                                   |                                                                  |
| source\_ids (**required**) | array of field IDs in the current config | a list of field ids to concatenate in the config                 |
| delimiter                  | string. default: " "                     | The delimiter with which to join the output of the source fields |

## Examples

The following example shows using the Concat method to concatenate two address fields into one.

**Config**

```JSON JSON 
{
  "fields": [
    {
      "id": "_recipient_street_address",
      "method": {
        "id": "label",
        "position": "below"
      },
      "anchor": {
        "match": [
          {
            "text": "street address (including apt",
            "type": "startsWith"
          }
        ]
      }
    },
    {
      "id": "_recipient_city_state",
      "method": {
        "id": "label",
        "position": "below"
      },
      "anchor": {
        "match": [
          {
            "text": "city or town, state or province",
            "type": "startsWith"
          }
        ]
      }
    }
  ],
  "computed_fields": [
    {
      "id": "recipient_full_address",
      "method": {
        "id": "concat",
        "source_ids": [
          "_recipient_street_address",
          "_recipient_city_state"
        ],
        "delimiter": "\n"
      }
    }
  ]
}
```

**Example document**

The following image shows the example document used with this example config:

![Click to enlarge](https://mintlify.s3-us-west-1.amazonaws.com/sensible/assets/v0/images/screenshots/concat.png)

| Example document | [Download link](https://raw.githubusercontent.com/sensible-hq/sensible-docs/main/readme-sync/assets/v0/pdfs/concat.pdf) |
| ---------------- | ----------------------------------------------------------------------------------------------------------------------- |

**Output**

\[

```json
{
  "_recipient_street_address": {
    "type": "string",
    "value": "123 Anystreet"
  },
  "_recipient_city_state": {
    "type": "string",
    "value": "Anytown, AZ 12345"
  },
  "recipient_full_address": {
    "value": "123 Anystreet\nAnytown, AZ 12345",
    "type": "string"
  }
}
`
```