Let's bring the Ethereum blockchain to Codewars! There's a simpler Kata available, Retrieve Ether Balance, that you should try first before attempting this one. I suspect this Kata will be a difficult challenge to start from.

This Kata makes use of the JavaScript Ethereum API web3.js, specifically the 1.0 version with documentation found here.

Where did my Ether go?

I've been making many Ether transactions lately, but I forgot to write down all the addresses I've sent Ether to! I could really use a function that I could call to find all the addresses I've sent Ether to.

Let's create this function findMyEther. It should take in a hexidecimal Ethereum address and return a promise which will resolve to an array of addresses that the address has sent ether to.