sbin0819

print("Hello World")

sbin0819

let getGCD = (num1, num2) => {
    let gcd = 1;
    for(let i=1; i<=Math.max(num1, num2); i++){
        if(num1 % i === 0 && num2 % i === 0){
            gcd = i;
        }
    }
    return gcd;
}

sbin0819

Authentication

# POST in terminal
$ curl -X POST http://localhost:4000/auth/login -d '{"username": "john", "password": "changeme"}' -H "Content-Type: application/json"

curl http://localhost:4000/profile -H "Authorization: Bearer ey..."

sbin0819

plain js

document.getElementById('drag').ondragstart = function() {
  e.dataTransfer.setData('data', this.innerHTML); // 드래그해보세요 문자열 전달
};

document.getElementById('drop').ondragover = function(e) {
  e.preventDefault(); // 필수 이 부분이 없으면 ondrop 이벤트가 발생하지 않습니다.
};

sbin0819

docker run -d -p 5432:5432 --name postgres -e POSTGRES_PASSWORD=password postgres

sbin0819

algo

debug

image

https://images.pexels.com
https://unsplash.com/

web3

• solidity

sbin0819

# Chapter 1
Web3.js

## basic

### 컨트랙트

```solidity
pragma solidity ^0.4.19;

sbin0819

regex 활용 심화

핸드폰 format

 function phoneFomatter(num,type){
    var formatNum = '';
    if(num.length==11){
        if(type==0){
            formatNum = num.replace(/(\d{3})(\d{4})(\d{4})/, '$1-****-$3');
        }else{
 formatNum = num.replace(/(\d{3})(\d{4})(\d{4})/, '$1-$2-$3');

sbin0819

library repo sample code

sbin0819

import {Platform, PermissionsAndroid} from 'react-native';
import {
  launchCamera,
  launchImageLibrary,
  ImagePickerResponse,
} from 'react-native-image-picker';

export const onHandleCamera = async () => {
  if (Platform.OS === 'android') {