# Object.map

## Function

Iterate over the object and write the callback return value to the new object.

## Syntax

```bt
object.map(callback)
```

## Parameters

| Parameters | Type | Required | Default value | Description |
| ------ | ------ | ------ | ------ | ------ |
| callback | Fn | No | Empty | The callback signature is fn(value, key, current). |

## Return value

| Type | Description |
| ------ | ------ |
| Object | Returns the new object after mapping. |

## Return object fields

The returned object uses the field names of the original object, and each field value is the callback return value. When the callback does not return a natural value, the field value is `empty`.

## Example

```bt
prices = {a: 1, b: 2}
result = prices.map(fn(value) { value * 10 })

// Output: {"a":10,"b":20}
print result
```

## Notes

- The returned object retains the original key name.
- The original object will not be modified.