js index to index

1var array = [2, 9, 9];
2array.indexOf(2);     // 0
3array.indexOf(7);     // -1
4array.indexOf(9, 2);  // 2
5array.indexOf(2, -1); // -1
6array.indexOf(2, -3); // 0

1let array = [5, "Foo", 3, "Bar"];
2array.slice(2);
3// Output = [3, "Bar"]
4
5let string = "Volvo Cars";
6string.slice(2);
7// Output = "lvo cars"