Fundamentals · easy

17. Truthiness & defaults

?? vs ||.

Write `rpcUrl(config)` returning `config.url` when provided, otherwise `"https://mainnet.base.org"`. An empty string must be preserved, so use `??`.

Required in your answer: ??

Runs in a sandboxed worker

function rpcUrl(config) {
  // TODO use ??
}

Output appears here.