js index to index
var array = [2, 9, 9];
array.indexOf(2); // 0
array.indexOf(7); // -1
array.indexOf(9, 2); // 2
array.indexOf(2, -1); // -1
array.indexOf(2, -3); // 0let array = [5, "Foo", 3, "Bar"];
array.slice(2);
// Output = [3, "Bar"]
let string = "Volvo Cars";
string.slice(2);
// Output = "lvo cars"
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