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Given an integer array arr and a filtering function fn, return a filtered array filteredArr.
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The fn function takes one or two arguments:
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arr[i] - number from the arr
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i - index of arr[i]
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filteredArr should only contain the elements from the arr for which the expression fn(arr[i], i) evaluates to a truthy value. A truthy value is a value where Boolean(value) returns true.
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Please solve it without the built-in Array.filter method.
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Example 1:
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Input: arr = [0,10,20,30], fn = function greaterThan10(n) { return n > 10; }
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Output: [20,30]
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Explanation:
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const newArray = filter(arr, fn); // [20, 30]
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The function filters out values that are not greater than 10
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Example 2:
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Input: arr = [1,2,3], fn = function firstIndex(n, i) { return i === 0; }
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Output: [1]
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Explanation:
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fn can also accept the index of each element
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In this case, the function removes elements not at index 0
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Example 3:
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Input: arr = [-2,-1,0,1,2], fn = function plusOne(n) { return n + 1 }
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