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var filterRange = function(arr, a, b) { for (var mas = [], i = 0; i < arr.length; i++) { if (a <= arr[i] && arr[i] <= b) { mas.push(arr[i]); } } return mas; }; var arr = [5, 4, 3, 8, 0]; var filtered = filterRange(arr, 3, 5); alert(filtered);