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Please help me with web3js part for below contract. I want to attach my smart contract to frontend. I am developing in truffle environment and I am not comfortable with promises.

pragma solidity ^0.4.18;
contract test{
    address public owner;

    uint public index;

    struct MyNumber{
        uint myNum;
    }

    mapping (uint => MyNumber) public records;

    function getNumber(uint _index) public view returns(uint){
        return records[_index].myNum;
    } 
    function setNumber(uint _num) public {
        records[index].myNum = _num;
        emit setNum (index, _num);
        index++;
    }

}

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