Using events in web3 v1.0

web3-v1.0-events.js

/* contract:
pragma solidity ^0.4.23;

contract A {
    event SomethingHappend(
        address indexed _from,
        uint _value
    );

    uint public x = 42;

    function someMethod() public view returns(uint)
    {
        return x;
    }

    function doSomething() public {
        x = x + 1;
        emit SomethingHappend(msg.sender, x);
    }
}
*/

const Web3 = require('web3');
let web3 = new Web3(new Web3.providers.WebsocketProvider('ws://localhost:8546'));

(async() => {
    let contract = await new web3.eth.Contract([{"constant":true,"inputs":[],"name":"x","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"doSomething","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"someMethod","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"anonymous":false,"inputs":[{"indexed":true,"name":"_from","type":"address"},{"indexed":false,"name":"_value","type":"uint256"}],"name":"SomethingHappend","type":"event"}]);

    let gasPrice = 8000000000;
    let fromAddres = '0x1fdf23c1c30a5e20c5dd7cb4fae9941105ddca40';
    contract.deploy({
        data: '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'
    }).send({
        from: fromAddres,
        gas: 4700000,
        gasPrice: gasPrice
    })
    .then((instance) => {
        instance.events.SomethingHappend({}).on('data', (event) => {
            console.log('event triggered');
            console.log(event);
        });

        instance.methods.doSomething().send({
            gas: 4700000,
            from: fromAddres,
            gasPrice: gasPrice
        });
    });
})();