JavaScript: Filter false, null, 0 and blank values from an array

JavaScript Array: Exercise-39 with Solution

Filter Array Values

Write a JavaScript function to filter false, null, 0 and blank values from an array.

Test Data :
console.log(filter_array_values([58, '', 'abcd', true, null, false, 0]));
[58, "abcd", true]

Visual Presentation:

Sample Solution:

JavaScript Code:

// Function to filter array values based on eligibility criteria
function filter_array_values(arr) {
  // Use the filter function with the custom eligibility check provided by 'isEligible'
  arr = arr.filter(isEligible);
  // Return the filtered array
  return arr;
}

// Function to check the eligibility of a value
function isEligible(value) {
  // Check if the value is not equal to false, null, 0, or an empty string
  if (value !== false || value !== null || value !== 0 || value !== "") {
    // If eligible, return the value
    return value;
  }
}

// Output the result of filtering the array with the custom eligibility check
console.log(filter_array_values([58, '', 'abcd', true, null, false, 0]));

Output:

[58,"abcd",true]

Flowchart:

ES6 Version:

// Function to filter array values based on eligibility criteria
const filter_array_values = (arr) => {
  // Use the filter function with the custom eligibility check provided by 'isEligible'
  arr = arr.filter(isEligible);
  // Return the filtered array
  return arr;
};

// Function to check the eligibility of a value
const isEligible = (value) => {
  // Check if the value is not equal to false, null, 0, or an empty string
  if (value !== false || value !== null || value !== 0 || value !== "") {
    // If eligible, return the value
    return value;
  }
};

// Output the result of filtering the array with the custom eligibility check
console.log(filter_array_values([58, '', 'abcd', true, null, false, 0]));

Live Demo:

See the Pen JavaScript - Filter false, null, 0 and blank values from an array-array-ex- 39 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

• Write a JavaScript function that filters false, null, 0, "", undefined, and NaN values from an array using filter().
• Write a JavaScript function that returns a new array containing only truthy values from the original array.
• Write a JavaScript function that manually iterates over an array to remove any falsy values.
• Write a JavaScript function that validates the array input and ensures the result contains only truthy elements.

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