Secure Token Transfer in Solidity | Dataford Interview Questions

Write a Solidity smart contract that implements a simple token transfer with basic security checks.

Implement the transfer logic represented by the reference function below. Reject nonpositive amounts, the zero address, unknown senders, and transfers exceeding the sender's balance. Failed transfers must leave balances unchanged.

Input: balances, sender, recipient, and integer amount. Output: an object containing success and the resulting balances.

Constraints

balances is a mapping from address strings to nonnegative integer balances
sender and recipient are address strings
amount is an integer
The zero address is represented by "0x0"
A failed transfer must not modify balances

Function Signature

def transfer_token(balances, sender, recipient, amount):

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Problem

Write a Solidity smart contract that implements a simple token transfer with basic security checks.

Input: balances, sender, recipient, and integer amount. Output: an object containing success and the resulting balances.

Constraints

balances is a mapping from address strings to nonnegative integer balances
sender and recipient are address strings
amount is an integer
The zero address is represented by "0x0"
A failed transfer must not modify balances

Function Signature

def transfer_token(balances, sender, recipient, amount):

Your question is Secure Token Transfer in Solidity. Start with the requirements in the Question tab.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.