Recursion Tree Visualizer

🥇 Winner project of the AlgoExpert SWE Project Contest 🥇

Overview

Stop drawing recursion trees by hand. Watch the demo video or check out the live project.

Folders structure

web: react user interface.
lambda: serverless lambda function to execute user-defined code remotely.

Local development

Web

In the web directory, run:

# to install all dependencies
$ npm install

# to run the app on http://localhost:3003
$ npm run start

Lambda

You can use the Amazon Runtime Interface Emulator (RIE), already contained in the docker image, to test the Lambda function.

In the lambda directory, run:

# build your local image
$ docker build --tag rtv .

# create and run a container using AWS RIE as executable to emulate a server for your lambda function
$ docker run --rm -p 8080:8080 rtv

# make a http request to your function, passing event with the -d in body field (escaped json), see examples in requests.http file
$ curl -XPOST "http://localhost:8080/2015-03-31/functions/function/invocations" -d '{"body":"{}"}'

Deploy to production

Lambda

In terraform folder:

create terraform.tfvars file
run terraform init
run terraform validate
run terraform plan
run terraform apply

Web

Ships web on Vercel, setup environment variables.

Acknowledgements

Thanks to Drawing Presentable Trees and Improving Walker's Algorithm to Run in Linear Time articles I implemented Reingold-Tilford's algorithm to position each node of the tree on a 2D plane in an aesthetically pleasing way.

Compatibility

For a better experience, I recommend using a chromium-based browser like Chrome or Edge.

Contact me

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