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

Last update on May 30 2022 10:02:27 (UTC/GMT +8 hours)

JavaScript Array: Exercise-39 with Solution

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]

Pictorial Presentation:

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

Sample Solution:

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JavaScript function to filter false, null, 0 and blank values from an array</title>
</head>
<body>

</body>
</html>

JavaScript Code:

function filter_array_values(arr) {
  arr = arr.filter(isEligible);
  return arr;
}

function isEligible(value) {
  if(value !== false || value !== null || value !== 0 || value !== "") {
    return value;
  }
}

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

Sample Output:

[58,"abcd",true]

Flowchart:

ES6 Version:

function filter_array_values(arr) {
  arr = arr.filter(isEligible);
  return arr;
}

function isEligible(value) {
  if(value !== false || value !== null || value !== 0 || value !== "") {
    return value;
  }
}

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.

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Next: Write a JavaScript function to generate an array of specified length, filled with integer numbers, increase by one from starting position.

JavaScript: Tips of the Day

How to insert an item into an array at a specific index (JavaScript)?

What you want is the splice function on the native array object.

arr.splice(index, 0, item); will insert item into arr at the specified index (deleting 0 items first, that is, it's just an insert). In this example we will create an array and add an element to it into index 2:

var arr = []; arr[0] = "Jani"; arr[1] = "Hege"; arr[2] = "Stale"; arr[3] = "Kai Jim"; arr[4] = "Borge"; console.log(arr.join()); arr.splice(2, 0, "Lene"); console.log(arr.join());

Ref: https://bit.ly/2BXbp04