Good afternoon! Here's our prompt for today.

The Concept: Removing Adjacent Duplicates

Imagine you're attending a magical carnival where you can pull adjacent duplicate letters from a string like pulling rabbits out of a hat. Exciting, right? Your goal is to get a clean string with no adjacent duplicates. In this lesson, we'll explore this problem with Linda's candy adventure.

The Problem

Linda loves candies and messages, so she wants to write a message on her cake with candies. However, she can't have adjacent duplicate candies; they need to be unique. Can you help her?

Objective: Help Linda by removing all adjacent duplicate letters until you get a string with no adjacent duplicates.

Visual Walkthrough: Unpacking the Bag of Candies

1. Starting String: Linda's bag of candies spells out "abbaca".

2. Step 1: Spot the first adjacent duplicate "bb". These candies can't be together. Remove them!

   • Result: "aaca"

3. Step 2: Next, we have another adjacent duplicate "aa". Let's remove those as well.

   • Result: "ca"

And voila! We're left with a string that doesn't have any adjacent duplicates, and it spells out "ca".

Constraints: The Boundaries of Our Magical Carnival

• The length of the string s will be between 1 and (10^5).
• The string s will only consist of lowercase English letters.

Try to solve this here or in Interactive Mode.

How do I practice this challenge?

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var assert = require('assert');

​

function remove_adjacent_duplicates(s) {

    // fill in the solution

    return s

}

​

​

try {

    assert.equal(remove_adjacent_duplicates('abbaca'), 'ca');

    console.log('PASSED: ' + "`remove_adjacent_duplicates('abbaca')` should return `'ca'`");

} catch (err) {

    console.log(err);

}

​

try {

    assert.equal(remove_adjacent_duplicates('azxxzy'), 'ay');

    console.log('PASSED: ' + "`remove_adjacent_duplicates('azxxzy')` should return `'ay'`");

} catch (err) {

    console.log(err);

}

​

try {

    assert.equal(remove_adjacent_duplicates('aaaa'), '');

    console.log('PASSED: ' + "`remove_adjacent_duplicates('aaaa')` should return `''`");

} catch (err) {

    console.log(err);

}

​

Here's our guided, illustrated walk-through.

How do I use this guide?