Hello, checkiomates🐱👤!
This week, we explore Cloudflare's new sandbox environment for serverless development, admire the beauty of a JavaScript-rendered fractal fern, and clear up a confusing concept with a deep dive into JavaScript's null. Our mission challenges you to track a robot's movement around a circular path, counting its visits to a specific control station.
💡TIP
You may click on any mission tag and see all missions, where this tag is present! If you want to discover all CheckiO features, visit our tutorial. It's a longread, but it's worth it!
🏁MISSION
Scarecrow Robot by freeman_lex -
A farmer employs a scarecrow robot to protect his cornfield. The robot follows a path around the plantation, passing through stations circled. Each day, the robot starts at station 1 and follows a series of commands that move it to neighboring stations, both clockwise (1) and counterclockwise (-1). Given also a number of control station, which is under monitoring, calculate how many times the robot visits the station during a day.
assert.strictEqual(visits(8, 3, [1, -1, 1, 1, 1, -1, 1, 1]), 2); assert.strictEqual(visits(5, 1, [1, 1, 1, 1]), 1); assert.strictEqual(visits(2, 1, [1]), 1);
📖ARTICLES
Sandbox for code from Cloudflare! -
Cloudflare Sandboxes is a new service for running untrusted JavaScript (and Python) code in a safe container-based 'sandbox' environment.
A Quick Tutorial on the Barnsley Fern Fractal -
The Barnsley fern is a fractal that represents a plant-like fern structure.
Piotr Zarycki goes much deeper into the history than you might expect.
👩💻CODE SHOT
What do you think the following code does?
function checkio(values){
let str = values.filter(el=>typeof(el)==='string').join('');
let number = values.filter(el=>typeof(el)==='number').reduce((acc,item)=>acc + item,0);
return [str,number];
}
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