---
title: "decodeDouble(forKey:)"
framework: foundation
role: symbol
role_heading: Instance Method
path: "foundation/nscoder/decodedouble(forkey:)"
---

# decodeDouble(forKey:)

Decodes and returns a double value that was previously encoded with either encode(_:forKey:) or encode(_:forKey:) and associated with the string key.

## Declaration

```swift
func decodeDouble(forKey key: String) -> Double
```

## Discussion

Discussion Subclasses must override this method if they perform keyed coding.

## See Also

### Decoding General Data

- [decodeArray(ofObjCType:count:at:)](foundation/nscoder/decodearray(ofobjctype:count:at:).md)
- [decodeBool(forKey:)](foundation/nscoder/decodebool(forkey:).md)
- [decodeBytes(forKey:returnedLength:)](foundation/nscoder/decodebytes(forkey:returnedlength:).md)
- [decodeBytes(withReturnedLength:)](foundation/nscoder/decodebytes(withreturnedlength:).md)
- [decodeData()](foundation/nscoder/decodedata().md)
- [decodeFloat(forKey:)](foundation/nscoder/decodefloat(forkey:).md)
- [decodeCInt(forKey:)](foundation/nscoder/decodecint(forkey:).md)
- [decodeInteger(forKey:)](foundation/nscoder/decodeinteger(forkey:).md)
- [decodeInt32(forKey:)](foundation/nscoder/decodeint32(forkey:).md)
- [decodeInt64(forKey:)](foundation/nscoder/decodeint64(forkey:).md)
- [decodeObject()](foundation/nscoder/decodeobject().md)
- [decodeObject(forKey:)](foundation/nscoder/decodeobject(forkey:).md)
- [decodePoint()](foundation/nscoder/decodepoint().md)
- [decodePoint(forKey:)](foundation/nscoder/decodepoint(forkey:).md)
- [decodePropertyList()](foundation/nscoder/decodepropertylist().md)