JAVASCRIPT

if odd js

function isEven(value) {
    return !(value % 2)
}

odd or even js

for(let count =0; count<=100;count++){
 count%2==0? console.log(`${count} is even`):console.log(`${count} is odd`);
 ;
}

odd even javascript

var arr = [1, 2, 3, 4, 5, 6, 7, 8, 9];
    
    for (var i = 0; i < arr.length; i++) {
      if (arr[i]%2 == 0) {
        arr.push(arr.splice(i, 1)[0]);
      }
    }
    
    console.log(arr);

is odd javascript

const isOdd = n => !!(n & 1)