How to use reduce In Javascript

Q: How to use reduce In Javascript

In this approach, we use reduce to iterate through the array, accumulate non-empty strings in one array, and collect removed elements in another array.

Using filter

In this approach, we use reduce to iterate through the array, accumulate non-empty strings in one array, and collect removed elements in another array.

Example: The below code example uses reduce to remove empty strings from array

JavaScript

function removeEmptyStrings(arr) {
    return arr
        .reduce((acc, val) => {
            if (val !== '') {
                acc.cleanedArray.push(val);
            } else {
                acc.removedElements.push(val);
            }
            return acc;
        }, { cleanedArray: [], removedElements: [] });
}

let inputArray = ["hello", "", "world", "", "!", " "];
let result = removeEmptyStrings(inputArray);

console.log("Cleaned Array:", result.cleanedArray);
console.log("Removed Elements:", result.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

Tags:

#JavaScript-Program #JavaScript #Web Technologies

Using filter

How to use reduce In Javascript

JavaScript Program to Remove Empty Strings from Array Without Loop

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