0storage_costs = {"on_chain": 10, "off_chain": 2}
data_size = 5
location = "on_chain"
total_cost = storage_costs[location] * data_size
print(total_cost)| Step | Variable | Value | Action | Output |
|---|---|---|---|---|
| 1 | storage_costs | {"on_chain": 10, "off_chain": 2} | Define cost per unit data | |
| 2 | data_size | 5 | Define data size to store | |
| 3 | location | "on_chain" | Choose data location | |
| 4 | total_cost | storage_costs["on_chain"] * 5 | Calculate total cost | 50 |
| 5 | print(total_cost) | Output total cost | 50 |
| Variable | Start | After Step 1 | After Step 2 | After Step 3 | After Step 4 | Final |
|---|---|---|---|---|---|---|
| storage_costs | undefined | {"on_chain": 10, "off_chain": 2} | {"on_chain": 10, "off_chain": 2} | {"on_chain": 10, "off_chain": 2} | {"on_chain": 10, "off_chain": 2} | {"on_chain": 10, "off_chain": 2} |
| data_size | undefined | undefined | 5 | 5 | 5 | 5 |
| location | undefined | undefined | undefined | "on_chain" | "on_chain" | "on_chain" |
| total_cost | undefined | undefined | undefined | undefined | 50 | 50 |
Data location affects cost because different storage options charge differently. Cost = cost_per_unit * data_size. On-chain storage is usually more expensive than off-chain. Choosing location impacts total cost directly. Always calculate cost before storing data.
storeData(userData) {
blockchain.save(userData);
offchain.save(userData);
}
Why might this cause unnecessary cost?Pass the test and this pattern moves unknown strong while earning +1 Grip toward your certificate.