name: Option
description: An Option is an optional field. Basically the first byte indicates that there is is value to follow. If the byte is 1 there is an actual value. So the Option implements that - decodes, checks for optionality and wraps the required structure with a value if/as required/found.
Type parameters
T : Codec
Hierarchy
Base<T>
↳ Option
Implements
Constructors
constructor
⊕ new Option(Type: Constructor, value?: any): Option
Overrides Base.constructor
Defined in codec/Option.ts:19
Parameters:
| Name | Type |
|---|---|
| Type | Constructor |
Optional value | any |
Returns: Option
Accessors
encodedLength
get encodedLength(): number
Defined in codec/Option.ts:56
description: The length of the value when encoded as a Uint8Array
Returns: number
isEmpty
get isEmpty(): boolean
Defined in codec/Option.ts:64
description: Checks if the Option has no value
Returns: boolean
isNone
get isNone(): boolean
Defined in codec/Option.ts:71
description: Checks if the Option has no value
Returns: boolean
isSome
get isSome(): boolean
Defined in codec/Option.ts:78
description: Checks if the Option has a value
Returns: boolean
value
get value(): Codec
Defined in codec/Option.ts:85
description: The actual value for the Option
Returns: Codec
Methods
eq
▸ eq(other?: any): boolean
Defined in codec/Option.ts:92
description: Compares the value of the input to see if there is a match
Parameters:
| Name | Type |
|---|---|
Optional other | any |
Returns: boolean
toHex
▸ toHex(): string
Defined in codec/Option.ts:103
description: Returns a hex string representation of the value
Returns: string
toJSON
▸ toJSON(): any
Implementation of Codec.toJSON
Defined in codec/Option.ts:110
description: Converts the Object to JSON, typically used for RPC transfers
Returns: any
toString
▸ toString(): string
Implementation of Codec.toString
Defined in codec/Option.ts:117
description: Returns the string representation of the value
Returns: string
toU8a
▸ toU8a(isBare?: undefined | false | true): Uint8Array
Defined in codec/Option.ts:125
description: Encodes the value as a Uint8Array as per the parity-codec specifications
Parameters:
| Name | Type | Description |
|---|---|---|
Optional isBare | undefined | false | true | true when the value has none of the type-specific prefixes (internal) |
Returns: Uint8Array
unwrap
▸ unwrap(): T
Defined in codec/Option.ts:143
description: Returns the value that the Option represents (if available), throws if null
Returns: T
unwrapOr
▸ unwrapOr<O>(defaultValue: O): T | O
Defined in codec/Option.ts:155
description: Returns the value that the Option represents (if available) or defaultValue if none
Type parameters:
O
Parameters:
| Name | Type | Description |
|---|---|---|
| defaultValue | O | The value to return if the option isNone |
Returns: T | O
<Static> decodeOption
▸ decodeOption<O>(Type: Constructor, value?: any): Codec
Defined in codec/Option.ts:26
Type parameters:
O
Parameters:
| Name | Type |
|---|---|
| Type | Constructor |
Optional value | any |
Returns: Codec
<Static> with
▸ with<O>(Type: Constructor): Constructor<Option<O>>
Defined in codec/Option.ts:45
Type parameters:
O : Codec
Parameters:
| Name | Type |
|---|---|
| Type | Constructor |
Returns: Constructor<Option<O>>