Violet-Bora-Lee

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.10;

// 매핑(Mapping)은 해시맵, 객채, 딕셔너리처럼 키-값 쌍이 있는 데이터를 저장할 때 사용한다.
contract Mapping {
    // 주소(키)와 uint(값)쌍을 매핑함
    mapping(address => uint) public myMap;

    function get(address _addr) public view returns (uint) {
        // 매핑은 항상 값을 반환하는데,

gaearon

If you haven’t worked with JavaScript in the last few years, these three points should give you enough knowledge to feel comfortable reading the React documentation:

• We define variables with let and const statements. For the purposes of the React documentation, you can consider them equivalent to var.
• We use the class keyword to define JavaScript classes. There are two things worth remembering about them. Firstly, unlike with objects, you don't need to put commas between class method definitions. Secondly, unlike many other languages with classes, in JavaScript the value of this in a method [depends on how it is called](https://developer.mozilla.org/en-US/docs/Web/Jav