I want to generate each number between 0 to 4 randomly using javascript and each number can appear only once. So I wrote the code:
for(var l=0; l<5; l++)
function getRanArr(lngth) { let arr = []; do { let ran = Math.floor(Math.random() * lngth); arr = arr.indexOf(ran) > -1 ? arr : arr.concat(ran); }while (arr.length < lngth) return arr; } const res = getRanArr(5); console.log(res);