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Filter Array Based on Condition

Certification: Basic Level Accuracy: 0% Submissions: 0 Points: 8

Write a JavaScript function to filter an array based on a given condition. The function should take an array and a callback function as parameters, and return a new array containing only the elements that satisfy the condition specified by the callback function.

Example 1
    
  
  • Input: arr = [1, 2, 3, 4, 5, 6], condition = (x) => x > 3
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  • Output: [4, 5, 6]
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  • Explanation: 
    • The input array contains numbers from 1 to 6. 
    • The condition function checks if each number is greater than 3. 
    • Testing: 1 > 3 (false), 2 > 3 (false), 3 > 3 (false). 
    • Testing: 4 > 3 (true), 5 > 3 (true), 6 > 3 (true). 
    • Only elements 4, 5, and 6 satisfy the condition. 
    • The filtered array [4, 5, 6] is returned.
    •
Example 2
    
  
  • Input: arr = ["apple", "banana", "cherry", "date"], condition = (str) => str.length > 5
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  • Output: ["banana", "cherry"]
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  • Explanation: 
    • The input array contains four string elements. 
    • The condition function checks if string length is greater than 5. 
    • Testing: "apple".length = 5 (not > 5, false). 
    • Testing: "banana".length = 6 (> 5, true). 
    • Testing: "cherry".length = 6 (> 5, true). 
    • Testing: "date".length = 4 (not > 5, false). 
    • Only "banana" and "cherry" satisfy the condition.
    •
Constraints
    
  
  • 1 ≤ arr.length ≤ 1000
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  • The callback function should return a boolean value
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  • Handle arrays with different data types
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  • Time Complexity: O(n) where n is the length of array
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  • Space Complexity: O(k) where k is the number of filtered elements
    •
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Hint
Solution

Solution Hints

    
  
  • Create an empty array to store filtered results
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  • Iterate through each element of the input array
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  • Apply the callback function to each element
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  • If callback returns true, add element to result array
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  • Use the built-in filter() method as an alternative approach
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  • Handle edge cases like empty arrays or null callbacks
    •

Steps to solve by this approach:

 Step 1: Use the built-in filter() method which is designed for this exact purpose.
 Step 2: Pass the condition callback function directly to the filter() method.
 Step 3: The filter() method automatically iterates through each array element.
 Step 4: For each element, it calls the condition function with that element as argument.
 Step 5: If the condition function returns true, the element is included in the result.
 Step 6: If the condition function returns false, the element is excluded.
 Step 7: Return the new filtered array containing only elements that passed the condition.

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