Add One More Please…

Setu Potnis
May 6, 2020 · 2 min read
Day 16

I hope you guys had a great day! I got a lot of work done on my work term report and got a lot of physical activity by going for a jog. Let me know what you guys do to stay active during this pandemic.

For today’s problem, I have to create a function that can basically turn an array of integers and return an array which is incremented by one. That sounded pretty confusing, so I’ll give you guys an example:

let arr1 = [1, 3, 9];
//function returns
arr1 = [1, 4, 0];

I started out by iterating through the whole array, starting at the end of the array and decrementing the counter for each iteration. If the value at the counter is greater than 9, then I make that digit equal to zero, otherwise, I just return the array after incrementing the digit by one.

for(let i = digits.length - 1; i >= 0; i--){
digits[i]++;
if(digits[i] > 9)
digits[i] = 0;
else
return digits;
}

Now if there is a special case, such as when the input array has all entries of 9, then the function would just return an array of zeros, in order to avoid this, I used the .unshift() method in order to add a value at the beginning of the array.

digits.unshift(1);
return digits;

So the full solution would be:

var plusOne = function(digits) {
for(var i = digits.length - 1; i >= 0; i--){
digits[i]++;
if(digits[i] > 9)
digits[i] = 0;
else
return digits;
}
digits.unshift(1);
return digits;
};

Let me know if you guys have any questions or any comments below! Thanks.

The Startup

Get smarter at building your thing. Join The Startup’s +793K followers.

Sign up for Top 10 Stories

By The Startup

Get smarter at building your thing. Subscribe to receive The Startup's top 10 most read stories — delivered straight into your inbox, once a week. Take a look.

By signing up, you will create a Medium account if you don’t already have one. Review our Privacy Policy for more information about our privacy practices.

Check your inbox
Medium sent you an email at to complete your subscription.

Setu Potnis

Written by

A university student wanting to learn more as well as share my journey about learning software

The Startup

Get smarter at building your thing. Follow to join The Startup’s +8 million monthly readers & +793K followers.

Setu Potnis

Written by

A university student wanting to learn more as well as share my journey about learning software

The Startup

Get smarter at building your thing. Follow to join The Startup’s +8 million monthly readers & +793K followers.

Medium is an open platform where 170 million readers come to find insightful and dynamic thinking. Here, expert and undiscovered voices alike dive into the heart of any topic and bring new ideas to the surface. Learn more

Follow the writers, publications, and topics that matter to you, and you’ll see them on your homepage and in your inbox. Explore

If you have a story to tell, knowledge to share, or a perspective to offer — welcome home. It’s easy and free to post your thinking on any topic. Write on Medium

Get the Medium app

A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store