How to use flatMap In Javascript
In this approach, we use flatMap to create a combined operation of filtering and mapping, where we can conditionally return values or empty arrays, effectively achieving the desired result.
Example: The below code example uses flatMap to remove empty strings from the array:
function removeEmptyStringsFlatMap(arr) {
const cleanedArray = arr.flatMap(val => val !== '' ? [val] : []);
const removedElements = arr.flatMap(val => val === '' ? [val] : []);
return { cleanedArray, removedElements };
}
let inputArray3 = ["hello", "", "world", "", "!", " "];
let result3 = removeEmptyStringsFlatMap(inputArray3);
console.log("Cleaned Array:", result3.cleanedArray);
console.log("Removed Elements:", result3.removedElements);
Output
Cleaned Array: [ 'hello', 'world', '!', ' ' ] Removed Elements: [ '', '' ]
Time Complexity: O(n)
Auxiliary Space: O(n)
JavaScript Program to Remove Empty Strings from Array Without Loop
Given an array with values and empty strings, our task is to remove empty strings from an array while keeping a record of the removed elements without using explicit loops.
Example:
Input: Array = ["hello", "", "world", "", "!", " "];
Output: Cleaned Array: [ 'hello', 'world', '!', ' ' ] Removed Elements: [ '', '' ]
Below are the approaches to remove empty strings from the array while keeping a record Without Loop in JavaScript:
Table of Content
- Using reduce
- Using filter
- Using flatMap