Does Ethereum Solidity support Associative Arrays?

0 votes

For example - Arrays with named indexes or hashes. Something like PHP code;

$array = array(
"foo" => "some foo value",
"bar" => "some bar value",);
Sep 14, 2018 in Blockchain by digger
• 26,670 points
136 views

2 answers to this question.

0 votes

Solidity supports a type called mapping:

contract MappingExample {
    mapping(address => uint) public balances;

    function update(uint newBalance) {
        balances[msg.sender] = newBalance;
    }
}

http://solidity.readthedocs.io/en/develop/types.html#mappings

answered Sep 14, 2018 by slayer
• 29,300 points
0 votes

Here's a little example that passes values around observing fixed-size rules compatible with the ABI.

contract StructExample {

    struct MyStruct {
        bool isMyStruct;
        uint amount;
        address[3] addressList;
        bytes32 name;
    }

    // storage instance of MyStruct
    MyStruct myStruct;

    function StructExample(
        uint amount, 
        address address1, 
        address address2, 
        address address3,
        bytes32 name) 
    {
        myStruct.isMyStruct = true;
        myStruct.amount = amount;
        myStruct.addressList = [address1, address2, address3];
        myStruct.name = name;
    }

    function getMyStruct() 
      constant
      returns(
          bool isMyStruct,
          uint amount,
          address[3] addressList,
          bytes32 name)
    {
        return (
            myStruct.isMyStruct, 
            myStruct.amount, 
            myStruct.addressList, 
            myStruct.name);
    }
}

answered Sep 17, 2018 by Bobin

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