4

From solidity 0.4.22, we can use a message with revert and require keywords to get an exact error message. ref

You can specify error reason strings for revert and require (support by tooling is still pending).

A sample contract illustrating this :

pragma solidity ^0.4.23;
contract TestExceptionHandling{
    uint public a ;
    constructor(uint _a) public{
        a= _a;
    }
    function increaseA(uint b) public{
        require(b > a, 'new value must be greater than a');
        if (b > 50){
            revert('Very large value');
        }
        a = b;
    }
}

This code compiler without nay error. This is really awesome, thanks to devs for this.

But how can I capture this error in my DAPP using web3 or so?

2

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