https://remix.ethereum.org/

Click : Plugin Manager (hình 1)

Gõ starknet vào ô tìm kiếm → enter → click→ Activate(hinh 2)

Click →File exploer (1)→ click chọn New file(2)→ đặt tên file với đuôi .cairo (3)

→ Enter

Click→ logo Starknet (hình 4)

Chọn wallet → kết nối ví Starknet(hình 5)

Copy Code bên dưới

#[starknet::interface]
trait ISimpleCounter<TContractState> {
    fn get_current_count(self: @TContractState) -> u128;
    fn increment(ref self: TContractState);
    fn decrement(ref self: TContractState);
}

#[starknet::contract]
mod SimpleCounter {
    #[storage]
    struct Storage {
        // Counter variable
        counter: u128,
    }

    #[constructor]
    fn constructor(ref self: ContractState, init_value: u128) {
        // Store initial value
        self.counter.write(init_value);
    }

    #[abi(embed_v0)]
    impl SimpleCounter of super::ISimpleCounter<ContractState> {
        fn get_current_count(self: @ContractState) -> u128 {
            return self.counter.read();
        }

        fn increment(ref self: ContractState) {
            // Store counter value + 1
            let counter = self.counter.read() + 1;
            self.counter.write(counter);
        }
        fn decrement(ref self: ContractState) {
            // Store counter value - 1
            let counter = self.counter.read() - 1;
            self.counter.write(counter);
        }
    }
}

Dán vào khung bên phải (hình 6) → Click nút Compile (hinh 6) →chọn Accept (hinh 7)

Điền số lượng token cần deploy (hình 8)→ bấm Deploy (hình 8)

Xác nhận giao dịch trên ví , phí tầm $0.28 → DONE

2/ Create a new folder on remix :

3/ Name this item and press Enter:

4/ Copy the code below and paste it into the blank field.

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;
contract FunctionTypes{
    uint256 public number = 5;
    
    constructor() payable {}

    // 函数类型
    // function (<parameter types>) {internal|external} [pure|view|payable] [returns (<return types>)]
    // 默认function
    function add() external{
        number = number + 1;
    }

    // pure: 纯纯牛马
    function addPure(uint256 _number) external pure returns(uint256 new_number){
        new_number = _number+1;
    }
    
    // view: 看客
    function addView() external view returns(uint256 new_number) {
        new_number = number + 1;
    }

    // internal: 内部
    function minus() internal {
        number = number - 1;
    }

    // 合约内的函数可以调用内部函数
    function minusCall() external {
        minus();
    }

    // payable: 递钱，能给合约支付eth的函数
    function minusPayable() external payable returns(uint256 balance) {
        minus();    
        balance = address(this).balance;
    }
}

5/ Click as shown in the picture.

6/ Last step Click on the Eth Logo and select the wallet connection metamask, remember to switch to #Scorll network then deploy and pay 0.3$ Scroll network fee.

7/ Check to see if you qualify:

https://scroll.io/developer-nft/check-eligibility