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Filter "in place"

importance: 4

Write a function filterRange(arr, a, b) that gets an array arr, looks for elements between a and b in it and returns an array of them.

The function should not modify the array. It should return the new array.

For instance:

let arr = [5, 3, 8, 1];

let filtered = filterRange(arr, 1, 4);

alert( filtered ); // 3,1 (matching values)

alert( arr ); // 5,3,8,1 (not modified)

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