Solidity vs Javascript arrays

Solidity arrays… are like Javascript arrays, right?

Nope..

In Solidity:

  • Arrays can only contain data of the same type (ex: arrays of integers, array of booleans, but not arrays of integers AND booleans..)
  • Arrays can be in storage, or in memory (persistent and non-persistent)
  • You can use the `push()` method to add elements ONLY for the storage arrays

I have created a short video tutorial with all the point above and many other tricks and tips for manipulating Solidity arrays.

Check it out, it’s free

By the way, in Dapp 30, where we create 30 smart contracts in Solidity where you will have a ton of practical experience manipulating arrays and advanced Solidity patterns. Check out the curriculum here.
 

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