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Share Your Experience: Take the 2024 Developer Survey
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eth
Moderator
  • Member for 8 years, 4 months
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246 votes
Accepted

What is the difference between a transaction and a call?

148 votes
Accepted

How is the address of an Ethereum contract computed?

140 votes
Accepted

Difference between CALL, CALLCODE and DELEGATECALL

136 votes
Accepted

What is a DApp?

128 votes

What is an ABI and why is it needed to interact with contracts?

128 votes
Accepted

What's the difference between 'msg.sender' and 'tx.origin'?

83 votes
Accepted

How can I check if an Ethereum address is valid?

71 votes
Accepted

What does the keyword "memory" do exactly?

67 votes
Accepted

Use string type or bytes32?

66 votes
Accepted

How to initialize an empty array and push items into it?

63 votes

How can I get a geth node to download the blockchain quickly?

59 votes
Accepted

How can you call a payable function in another contract with arguments and send funds?

55 votes

What is meant by the term "gas"?

55 votes
Accepted

Do contracts also have a nonce?

52 votes
Accepted

How to quickly test a Solidity function?

51 votes

Why are selfdestructs used in contract programming?

49 votes
Accepted

What does v, r, s in eth_getTransactionByHash mean?

48 votes
Accepted

How do you get a json file (ABI) from a known contract address?

47 votes
Accepted

How to delete an element from a mapping?

46 votes
Accepted

Is there a table of EVM instructions and their gas costs?

44 votes
Accepted

How can I find out what the highest block is?

44 votes
Accepted

What is calldata?

43 votes
Accepted

Convert address to string

41 votes
Accepted

Store data in mapping vs. array

41 votes

Help with very slow mist sync

40 votes
Accepted

What is the zero, empty or null value of a struct?

39 votes
Accepted

Why do Solidity examples use bytes32 type instead of string?

38 votes
Accepted

What are Ethereum transaction receipts and what are they used for?

37 votes

Difference between Memory and Storage?

36 votes
Accepted

How to access the event log by knowing the contract address (web3)?

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