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Filter range

importance: 4

Write a function filterRange(arr, a, b) that gets an array arr, looks for elements with values higher or equal to a and lower or equal to b and return a result as an array.

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)

Open a sandbox with tests.

function filterRange(arr, a, b) {
  // added brackets around the expression for better readability
  return arr.filter(item => (a <= item && item <= b));
}

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)

Open the solution with tests in a sandbox.

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