[j0hnik]

Alexandroppolus,

var arr = [1,1,2,5,9,9,7,7];
function unq(arr){
	var newArr = [];
	for(var i = 0; i<arr.length; i++){
		var x = arr[i];
		arr[i] = null;
		if(!arr.includes(x)) {
			newArr.push(x);
			if(newArr.length == 2) return newArr;
			continue;
		}
		arr[i] = x;
	}
}

console.log(unq(arr));