# Context Class (/developers/pinets/architecture/runtime/context)



## The Context Class (`Context.class.ts`) [#the-context-class-contextclassts]

The `Context` is the central object (usually named `$`) passed to the transpiled function. It acts as the container for:

1. **Market Data**: `$.data.open`, `$.data.close`, etc.
2. **User Variables**: `$.let`, `$.const`, `$.var`.
3. **Function State**: `$.taState`, `$.params`.
4. **Namespaces**: `$.ta`, `$.math`, `$.request`, `$.pine`.

## Initialization (`init`) [#initialization-init]

The `init` method is used for every variable assignment.

```typescript
init(target, source, index = 0)
```

* If `target` exists, it updates the current value.
* If `target` is null, it creates a new `Series`.
* It handles converting raw values or arrays into `Series`.

## Accessors (`get` / `set`) [#accessors-get--set]

PineTS uses specific accessors to handle Pine Script indexing semantics.

* `get(series, index)`: Returns `series[length - 1 - index]`. Index 0 is the most recent item.
* `set(series, value)`: Updates `series[length - 1]`.

## Precision [#precision]

All numeric outputs are routed through `context.precision()` to enforce consistent decimal rounding (default 10 places), matching Pine Script behavior.