Why is a Javascript implementation of some very basic algorithms interesting or noteworthy?...
"Atwood's Law: any application that can be written in JavaScript, will eventually be written in JavaScript."
It's kind of a joke thing.
From the wiki (https://github.com/felipernb/algorithms.js/wiki):
The intention is to blend academic concepts with the
JavaScript bits of insanity, applying Atwood's Law to CS101.