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Asset Id

Icon LinkAsset ID

An Asset ID can be represented using the AssetId type. It's definition matches the Sway standard library type being a Struct wrapper around an inner Bits256 value. 

// #import { AssetId };
 
const assetId: AssetId = {
  bits: Bits256,
};

Icon LinkUsing an Asset ID

The AssetId type can be integrated with your contract calls. Consider the following contract that can compares and return an Asset ID: 

contract;
 
abi EvmTest {
    fn echo_asset_id() -> AssetId;
    fn echo_asset_id_comparison(asset_id: AssetId) -> bool;
}
 
const ASSET_ID: AssetId = AssetId::from(0x9ae5b658754e096e4d681c548daf46354495a437cc61492599e33fc64dcdc30c);
 
impl EvmTest for Contract {
    fn echo_asset_id() -> AssetId {
        ASSET_ID
    }
 
    fn echo_asset_id_comparison(asset_id: AssetId) -> bool {
        asset_id == ASSET_ID
    }
}

The AssetId type can be used with the SDK and passed to the contract function as follows: 

// #import { AssetId };
 
const assetId: AssetId = {
  bits: Bits256,
};
 
const { value } = await contract.functions.echo_asset_id_comparison(assetId).simulate();
 
expect(value).toBeTruthy();

And to validate the returned value: 

// #import { AssetId };
 
const assetId: AssetId = {
  bits: Bits256,
};
 
const { value } = await contract.functions.echo_asset_id().simulate();
 
expect(value).toEqual(assetId);