Some coding tricks I found at work

function removeFirstTwo(list){

const [,,...arr] = list

return arr

}

Swap 2 numbers without temp variable

int x = 10, y = 5;

x = x + y;

y = x - y;

x = x - y;

Download file in UI by creating a temp link

downloadPDF = (pdfLink, pdfName) => {
  axios({
    url: pdfLink,
    method: 'GET',
    responseType: 'blob', // important
  }).then((response) => {
    const url = window.URL.createObjectURL(new Blob([response.data]));
    const link = document.createElement('a');
    link.href = url;
    link.setAttribute('download', pdfName);
    document.body.appendChild(link);
    link.click();
    document.body.removeChild(link);
  });

}; 

Sometimes useful for StringBuilder

String SEPARATOR = "";

for(int i = 0; i < arr.length; i++){

    sb.append(SEPARATOR);

    sb.append(arr[i]);

    SEPARATOR=",";

}

Autowired in static

@Component

public class StaticLogger{

    private static Dao dao;

    @Autowired

    private Dao dao1;

    @PostConstruct

    private void initStaticDao(){

        dao = this.dao1;

    }

}

Destructure is good, but better with default value, const {a, b, c} = obj || {}

Better if statement check

const condition = [1,2,3,4]

if(condition.includes(type)){...}

if(value??'' !==''){...}

Get flaten array from object, Object.values(deps).flat(Infinity)