Lesson 10: contractAddresses[chainId][0] returns 0

[software-dev2010]

Hello, I'm at lesson 10 and in the LotteryEntrance.js is this line of code that will set the value 0 for the raffleAddress:

const raffleAddress = chainId in contractAddresses ? contractAddresses[chainId][0] : null;

And this is the contractAddresses.json:

{"31337":"0xCf7Ed3AccA5a467e9e704C703E8D87F634fB0Fc9"}

For me, this contractAddresses[chainId][0] returns 0, and this contractAddresses[chainId] will return the 0xCf7Ed3AccA5a467e9e704C703E8D87F634fB0Fc9.

I don't understand how is it possible to work for you? Thank you!

[alfaqi]

Because you are assigning the value directly,
but others made is an array
like this
{"31337":["0xCf7Ed3AccA5a467e9e704C703E8D87F634fB0Fc9"]}