Ethereum Developer Test 2

Question 1

To create intelligent contracts:

Accepted Answer

A local in-memory blockchain with unit tests is an excellent place to start. Next, test and debug the smart contract with beta users on a test network like Ropsten or Rinkeby to iron out any last kinks before deploying it to the main network.

Answer

A test-net with beta users, such as the Rinkeby or Ropsten testnet, is a nice place to start before testing it locally on an in-memory blockchain simulation like Ganache. Then roll it out to the main network.

Answer

A local in-memory blockchain with unit tests is a good place to start, but as soon as you can, deploy to the main-net.

Question 2

To prevent problems during updates to the Ethereum platform

Accepted Answer

The ability to suspend a contract is useful for managing the risky capital.

Answer

Ethereum does not make platform upgrades. It is fixed and complete.

Answer

It's a good idea to send out a newsletter informing users of the updates.

Question 3

In which location did the #eth2interop lock in occur?

Accepted Answer

Canada

Answer

Korea

Answer

USA

Answer

Mexico

Question 4

When developing a game like battleship poker, where you must conceal the values of your opponents,

Accepted Answer

Since the information on the blockchain is public and only the call is private, only other smart contracts would be able to access it. This means that nothing can be hidden on the blockchain.

Answer

With agreements outside of the company holding such principles. By doing this, we can ensure that the information flow follows a clear logic and that no one else has access to it.

Answer

Using personal state variables. In this manner, only the smart contract itself and no one else can view the data.

Question 5

What makes unit testing so crucial?

Accepted Answer

It aids in the discovery of errors, regression errors, and occasionally even aids in the understanding of your code from many perspectives

Answer

Working on something for which you are compensated is a terrific way to spend time. But in the end, it will just slow down the process of development.

Answer

All of the statement are true.

Question 6

What videogame mechanics are typically referenced when discussing the balance in opcode pricing?

Accepted Answer

Starcraft

Answer

Diablo

Answer

PubG

Answer

Defence of the Ancient

Question 7

Having a bug-bounty program from the beginning...

Accepted Answer

Can assist in getting the public to test your smart contracts, which will help uncover flaws early.

Answer

Is wholly ineffective. who would like to evaluate beta software. Start the bug-bounty program as soon as the contract is made available on the main network.

Answer

Could be difficult because most of it is administrative work.

Question 8

It's a good idea to think about smart contracts and the blockchain. Which statemet is TRUE?

Accepted Answer

Only transferring components to the blockchain that actually require it. By doing this, smart contracts will be less complicated and easy to interpret as well as test.

Answer

To transfer the portions of the system that handle Ether transfers to the blockchain. The rest can continue to be stored in conventional database systems. In this manner, the blockchain solely contains the value transfer.

Answer

To transfer all current logic to the blockchain so that everything functions as one unit. It might be more complicated this way, but it's also simpler to keep up.

Question 9

How a smart contract disburses funds

Accepted Answer

To guarantee that participants can receive their money regardless of the contract state, it is wise to use both a push and a pull mechanism. It should have a withdraw mechanism in addition to pushing.

Answer

Using just the pull method—not the push method—is advised.

Answer

Pushing over pulling is preferable.

Question 10

Including community feedback in your testing

Accepted Answer

Is excellent because they frequently uncover bugs that weren't anticipated.

Answer

Is bad since you might leak information.

Answer

None of the above.