transformDecoder
Call Signature
transformDecoder<
TOldTo,TNewTo,TSize>(decoder,map):FixedSizeDecoder<TNewTo,TSize>
Transforms a decoder by mapping its output values.
This function takes an existing Decoder<A> and returns a Decoder<B>, allowing values of type A
to be converted into values of type B after decoding. The transformation is applied via the map function.
This is useful for post-processing, type conversions, or enriching decoded data.
For more details, see transformCodec.
Type Parameters
| Type Parameter | Description |
|---|---|
TOldTo | The original type returned by the decoder. |
TNewTo | The new type that will be transformed after decoding. |
TSize extends number | - |
Parameters
| Parameter | Type | Description |
|---|---|---|
decoder | FixedSizeDecoder<TOldTo, TSize> | The decoder to transform. |
map | (value, bytes, offset) => TNewTo | A function that converts values of TOldTo into TNewTo after decoding. |
Returns
FixedSizeDecoder<TNewTo, TSize>
A new decoder that decodes into TNewTo.
Example
Decoding a stored u32 length into a string of 'x' characters.
See
Call Signature
transformDecoder<
TOldTo,TNewTo>(decoder,map):VariableSizeDecoder<TNewTo>
Transforms a decoder by mapping its output values.
This function takes an existing Decoder<A> and returns a Decoder<B>, allowing values of type A
to be converted into values of type B after decoding. The transformation is applied via the map function.
This is useful for post-processing, type conversions, or enriching decoded data.
For more details, see transformCodec.
Type Parameters
| Type Parameter | Description |
|---|---|
TOldTo | The original type returned by the decoder. |
TNewTo | The new type that will be transformed after decoding. |
Parameters
| Parameter | Type | Description |
|---|---|---|
decoder | VariableSizeDecoder<TOldTo> | The decoder to transform. |
map | (value, bytes, offset) => TNewTo | A function that converts values of TOldTo into TNewTo after decoding. |
Returns
VariableSizeDecoder<TNewTo>
A new decoder that decodes into TNewTo.
Example
Decoding a stored u32 length into a string of 'x' characters.
See
Call Signature
transformDecoder<
TOldTo,TNewTo>(decoder,map):Decoder<TNewTo>
Transforms a decoder by mapping its output values.
This function takes an existing Decoder<A> and returns a Decoder<B>, allowing values of type A
to be converted into values of type B after decoding. The transformation is applied via the map function.
This is useful for post-processing, type conversions, or enriching decoded data.
For more details, see transformCodec.
Type Parameters
| Type Parameter | Description |
|---|---|
TOldTo | The original type returned by the decoder. |
TNewTo | The new type that will be transformed after decoding. |
Parameters
| Parameter | Type | Description |
|---|---|---|
decoder | Decoder<TOldTo> | The decoder to transform. |
map | (value, bytes, offset) => TNewTo | A function that converts values of TOldTo into TNewTo after decoding. |
Returns
Decoder<TNewTo>
A new decoder that decodes into TNewTo.
Example
Decoding a stored u32 length into a string of 'x' characters.