## Dynamic
Component and system addresses can change when upgrading/deploying. These addresses are instead stored in World, and reference via its id.
```typescript
const getCompAddr = async (strID: string): Promise => {
const world = new ethers.Contract(worldAddr, WorldABI, provider);
const systemRegistry = await world.components();
const id = ethers.utils.solidityKeccak256(['string'], [strID]);
return await getAddrByID(systemRegistry, id);
};
const getSystemAddr = async (strID: string): Promise => {
const world = new ethers.Contract(worldAddr, WorldABI, provider);
const systemRegistry = await world.systems();
const id = ethers.utils.solidityKeccak256(['string'], [strID]);
return await getAddrByID(systemRegistry, id);
};
const getAddrByID = async (
compsAddr: string,
id: BigNumberish
): Promise => {
const comp = new ethers.Contract(compsAddr, UintCompABI, provider);
const values = await comp.getEntitiesWithValue(id);
return values.length > 0 ? values[0].toHexString() : '0x0000000000000000000000000000000000000000';
};
```
---
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