Project Euler Starter Pack: Javascript Edition

Starter pack for Project Euler. Written in Javascript, running on node.js, locally hosted in an aesthetically elegant website.

How to use

• Install Node.js and npm
• git clone the repository.

cd project-euler-js-website
npm install
node index.js

If you want to load more than the first 20 problems, change the line rebuild_scripts(20); in index.js.

Now open localhost:3000 in your browser. The first loading would take a while as it generates all the html pages, but after that it would only regenerate the pages if you update the corresponding js file.

Every time you finish a js file in the scripts folder, just refresh any page, and the server would run the js file, get the answer, then generate the corresponding html file. Note that if you accidentally made an infinite loop, you're out of luck and would have to kill the server. I would have coded in an automatic time-out, but it's hard to figure out how long to wait, since some problems could take minutes to finish computing, so please just use your own judgment.

To solve a problem, go to the scripts folder. Replace the 0 in this function of each file:

exports.solution = () => {
    return 0;
};

For example, this is in my 1.js:

exports.solution = () => {
    let ans = 0;
    for (let i = 1; i < 1000; i++){
        if (i % 3 === 0 || i % 5 === 0) {
            ans += i;
        }
    }
    return ans;
};

You can find solutions online. I don't think it's cheating to have numerical solutions. After all, you still have to code up your solutions.

Dependencies

"dependencies": {
    "axios": "^1.4.0",
    "cheerio": "^1.0.0-rc.12",
    "express": "^4.18.2",
    "handlebars": "^4.7.7"
}

Credits

The CSS file used is MIT licensed from Simple.css by Kev Quirk.

The answers in ansewrs.txt are from luckytoilet/projecteuler-solutions: Numerical answers to all Project Euler problems.