<script>
let arr = [1,2,2,3,3,3,4,5];
let uniqueArr = [...new Set(arr)]; // [1,2,3,4,5]
</script>
<script>
let arr = [1,2,2,3,3,3,4,5];
let uniqueArr = arr.filter((v, i, self) => self.indexOf(v) === i);
</script>
<script>
condition ? return A : return B
</script>
<script>
return condition ? A : B
</script>