Function optionalField

optionalField<T>(name, value, child): Decoder<T>
Same as Decode.field, but it doesn't fail when the property is not present on the object. In that case, the provided value is returned.
Type Parameters
- T
Parameters
- name: string
  Name of the property
- value: T
  The value to use if the field is absent
- child: Decoder<T>
  The decoder to run on the value of that property
Returns Decoder<T>
Example
```
const decoder = Decode.optionalField('value', 100, Decode.integer);

decode(decoder, { value: 42 }) === 42
decode(decoder, {}) === 100
decode(decoder, 42) // Fails
```
- Defined in index.d.ts:261

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