Web3 Endpoint Cycling

This code will loop until isConnected is truthy, cycling through an array of endpoints until it is able to connect to one.

 while (!isConnected) {
     endpointsClone = [...endpoints]
     await new Promise(async (resolve, reject) => {
         try {
             while (!isConnected) {
                 (endpointsClone.length === 0) && (resolve(false))
                 const idx = Math.floor(Math.random() * endpointsClone.length)
                 web3endpoint = endpointsClone.slice(idx, idx + 1)[0]
                 try {
                     await web3.setProvider(web3endpoint)
                     await web3.eth.getBlockNumber()
                     isConnected = web3.currentProvider.connected
                 } catch (err) {
                     console.error(err)
                 }
                 await this.sleep(1000)
             }
             window.web3 = web3
             resolve(true)
         } catch(err) {
             reject(err)
         }
     })
 }

Some further enhancements could be made like checking ping/connection time for the endpoints. Maybe I'll add that when I'm not inundated with other TODOs :)

Check out the gist here.