# Map and Form Data Extensions

Chainable `Map` helpers and the `$map`/`$json` converters for `FormData` and `<form>` elements.

## Map

Source: `src/prototype/Map.ts`

| Method / Property | Description |
| --- | --- |
| `map.length` | `this.size` |
| `map.$keys` / `map.$values` | Iterators over keys / values |
| `map.$json` | `Object.fromEntries(this)` |
| `map._(key, value?)` | Chainable `set(key, value)` |
| `map.$(key?)` | `get(key)` |
| `map.$_(key?)` | Chainable `delete(key)` |
| `map.$$(key?)` | `has(key)` if given, else `this.size > 0` |

## FormData

Source: `src/prototype/FormData.ts`

| Method / Property | Description |
| --- | --- |
| `formData.$map` | Entries as a `Map` |
| `formData.$json` | Entries as a plain object |

## HTMLFormElement

Source: `src/prototype/HTMLFormElement.ts`

| Method / Property | Description |
| --- | --- |
| `form.$map` | Form fields as a `Map` (via an internal `FormData` wrapper) |
| `form.$json` | Form fields as a plain object |