Prove Your Ethereum Development Skills

Which is TRUE about Events?

Cannot be accessible by contracts because they are stored in a side-chain or similar structure.

When a contract contacts another contract, they a) Are stored on chain and provide a wonderful way to receive a return value.

Are mostly employed in Solidity for debugging exceptions.

Correct! Wrong!

Which network node is not PoW?

Morden

Rinkeby

Olympic

Ropsten

Correct! Wrong!

Solidity has the following value types.

Fixed Point Numbers, Integers, Booleans, and Structures

Solidity has the following value kinds.

Addresses, Integer, Boolean, and Enum

Correct! Wrong!

Variables of the type address hold

A string

A value of 20 bytes

A value of 32 bytes

A 20-character hexadecimal number

Correct! Wrong!

A version pragma is a great method

To identify the blockchain for which a smart contract was created. It aids in avoiding misunderstandings with beta users.

To identify the blockchain node for which a smart contract was created. It is beneficial to avoid combining various Go-Ethereum iterations.

To identify the compiler version for which a smart contract was created. Keeping changes from breaking helps.

Correct! Wrong!

What was the name of Teku's eth2 client prior to their rebranding?

Apollo

Poseidon

Artemis

Zeus

Correct! Wrong!

Which is TRUE about Loops in Solidity?

Should be avoided as much as possible due to potential negative impact on gas requirements.

Are an excellent approach to get around the need for gas because a loop only uses gas once.

Are risky when employed with expanding data structures, like arrays or mapping, because it is difficult to predict the gas requirements

Correct! Wrong!

Which is TRUE when defining a new datatype?

Using a struct is preferable because it is less expensive than launching a new contract.

Solidity does not support the creation of new datatypes.

A contract with public storage variables is recommended since it can be utilized like a class.

Correct! Wrong!

The result of the division of two integers, 5/2, is

.5, as it is instantly transformed into a float.

2, as the decimal point has been truncated.

3, as it is always rounded

None of the above.

Correct! Wrong!

As per the official Style Guide,

Both the function names and the contract should be in mixed case. It is proper to capitalize events. There should be a maximum of 120 characters per line and 2 spaces used as indentation.

To avoid misunderstanding with JavaScript, you should capitalize function names, events, and contract names. To indent, use Tabs, and keep lines to a maximum of 80 characters.

Functions should use mixedCase, while contract names should be capitalized. You should indent text with four spaces and limit lines to 79 (or 99) characters.

Correct! Wrong!

The elements of a mapping are keys and values.

The key cannot be another mapping, struct, enum, or dynamically sized array; the value can be anything.

The value cannot be another mapping or struct, but the keys may be anything.

The key cannot be another mapping, a struct, an integer, or a Boolean value. The value can be anything.

Correct! Wrong!

Ethereum Developer Test 4

Which is TRUE about Events?

Which network node is not PoW?

Solidity has the following value types.

Variables of the type address hold

A version pragma is a great method

What was the name of Teku's eth2 client prior to their rebranding?

Which is TRUE about Loops in Solidity?

Which is TRUE when defining a new datatype?

The result of the division of two integers, 5/2, is

As per the official Style Guide,

The elements of a mapping are keys and values.

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