Option

Variant 426 v411

Option

About This Type

Optional value: Some(value) or None.

Used when a value may or may not be present. Common in storage queries where a key may not exist.

Encoding: Variant: 0x00 = None, 0x01 = Some(value). Exception: Option<bool> uses 0x00=None, 0x01=true, 0x02=false.

Variants (2)

IndexNameFieldsDocs
0Nonenone
1Some
MultiSignature

SCALE Encoding

Rule
1-byte variant index followed by variant-specific field data. 2 possible variants.
Size
variable (1+ bytes)

Examples

None
0x00
00 Variant index 0 = None
Some = Some(MultiSignature)
0x01<field0>
01 Variant index 1 = Some
field 0 field0: MultiSignature

Code Examples

import { TypeRegistry } from "@polkadot/types";

const registry = new TypeRegistry();

// Encode Option — variant "None"
const value = registry.createType("Option", "None");
console.log("Hex:", value.toHex());

Type Parameters

T = MultiSignature

Referenced By (60)

#39 SubtensorModule::Event via SubnetLeaseCreated.end_block#68 Sudo::Event via KeyChanged.old#73 Scheduler::Event via Dispatched.id#73 Scheduler::Event via RetrySet.id#73 Scheduler::Event via RetryCancelled.id#73 Scheduler::Event via CallUnavailable.id#73 Scheduler::Event via PeriodicFailed.id#73 Scheduler::Event via RetryFailed.id#73 Scheduler::Event via PermanentlyOverweight.id#123 WeightsPerClass via max_extrinsic#123 WeightsPerClass via max_total#123 WeightsPerClass via reserved#141 StoredPendingChange via forced#231 SubnetLease via end_block#234 SubtensorModule::Call via swap_hotkey.netuid#234 SubtensorModule::Call via swap_hotkey_v2.netuid#234 SubtensorModule::Call via register_network_with_identity.identity#234 SubtensorModule::Call via remove_stake_full_limit.limit_price#234 SubtensorModule::Call via register_leased_network.end_block#234 SubtensorModule::Call via add_stake_burn.limit

and 40 more...

Type Information

Type ID
426
Kind
Variant
Path
Option
Runtime
v411
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