js Get the current value in the array index

const ARR = [. 1, 2,. 3,. 4,. 6, 22 is, 55, 33 is, 66, 44 is];
const getIndex = ((ARR, Item) => {
for (var I in ARR) {
IF (ARR [I ] == Item) {
return I;
};
};
});
getIndex (ARR,
55); ----------------
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