Minimal proxy (clone) pattern in Blockchain / Solidity - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare the minimal proxy contract address variable.

Blockchain / Solidity

address public [1];

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Aowner

Bimplementation

Cproxy

Dclone

Attempts:

3 left

💡 Hint

Common Mistakes

Using owner or proxy as the variable name instead of implementation.

The variable implementation stores the address of the original contract to clone.

2fill in blank

medium

Complete the code to create a minimal proxy clone using assembly.

Blockchain / Solidity

assembly {
  let clone := create(0, [1], 0x37)
}

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A0x3d602d80600a3d3981f4

B0x602d80600a3d3981f3

C0x3d602d80600a3d3981f3

D0x3d602d80600a3d3981f2

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect bytecode length or wrong last byte in the sequence.

The bytecode 0x3d602d80600a3d3981f3 is the standard minimal proxy creation code prefix.

3fill in blank

hard

Fix the error in the function that returns the address of the clone.

Blockchain / Solidity

function getClone() public view returns (address) {
  return [1];
}

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Aaddress(this)

BcloneAddress

Cimplementation

Dclone

Attempts:

3 left

💡 Hint

Common Mistakes

Returning implementation instead of the clone address.

The function should return the clone address, which is the deployed proxy.

4fill in blank

hard

Fill both blanks to complete the clone creation and initialization.

Blockchain / Solidity

function cloneAndInit() external returns (address) {
  address [1];
  assembly {
    [2] := create(0, add(code, 0x20), mload(code))
  }
  require([1] != address(0), "Clone failed");
  return [1];
}

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Aclone

BcloneAddress

DnewClone

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names for declaration and assignment.

The variable clone is declared and assigned the new clone address inside assembly.

5fill in blank

hard

Fill all three blanks to complete the dictionary comprehension that maps clone addresses to owners.

Blockchain / Solidity

mapping(address => address) public [1];

function registerClone(address [2], address [3]) external {
  clones[[2]] = [3];
}

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Aclones

BcloneAddr

CownerAddr

DcloneAddress

Attempts:

3 left

💡 Hint

Common Mistakes

Using inconsistent parameter names or mapping name.

The mapping is named clones, and the function parameters are cloneAddress and ownerAddr.