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feat(usable-tokens): add details to subject

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nprimo 2024-02-01 17:42:05 +01:00 committed by Niccolò Primo
parent 754fb37d06
commit 399d25fc0b
1 changed files with 31 additions and 4 deletions
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subjects/blockchain/usable-token/README.md
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### Instructions
- Create a Smart Contract named `UsableToken`
- Like MinimalToken, its constructor takes as parameter an amount that is given initially to the deployer.
- Create a function `approve(address,uint)` that allows the owner of the token to approve a spender to spend a certain amount of tokens.
- Create a function `allowance(address,uint)` that returns the amount of tokens that a spender can spend on behalf of the owner.
- Complete the following Smart Contract named `UsableToken`
- Like `MinimalToken`, its constructor takes as parameter an amount that is
given initially to the deployer account.
- Create a function `transfer(address, uint)` that allows the owner to transfer
a certain amount of tokens to the specified address.
- Create a function `approve(address, uint)` that allows the owner of the token
to approve a spender to spend a certain amount of tokens.
- The `allowance` states should keep track of the amount of tokens that a
spender can spend on behalf of the owner.
```js
contract UsableToken {
... public accounts;
... public allowance;
constructor(uint256 initialNumber) {
...
}
function transfer(address to, uint256 amount) public {
...
}
function approve(address spender, uint256 amount) public {
...
}
function transferFrom(address from, address to, uint256 amount) public {
}
}
```
### Notions