diff --git a/contracts/drafts/ERC777/ERC777.sol b/contracts/drafts/ERC777/ERC777.sol
index 84580ce8d2c..672b596e924 100644
--- a/contracts/drafts/ERC777/ERC777.sol
+++ b/contracts/drafts/ERC777/ERC777.sol
@@ -29,12 +29,13 @@ contract ERC777 is ERC777Base {
         bytes memory data,
         bytes memory operatorData
     )
+    public
     ERC777Base(
         name,
         symbol,
         granularity,
         defaultOperators
-    ) public {
+    ) {
         _mint(
             msg.sender,
             msg.sender,
diff --git a/contracts/drafts/ERC777/ERC777Base.sol b/contracts/drafts/ERC777/ERC777Base.sol
index d0c89b99cbf..8e47bcdbdff 100644
--- a/contracts/drafts/ERC777/ERC777Base.sol
+++ b/contracts/drafts/ERC777/ERC777Base.sol
@@ -29,8 +29,8 @@ contract ERC777Base is IERC777, ERC1820Client {
 
     address[] private _defaultOpsArray;
 
-    bytes32 constant sendHash = keccak256("ERC777TokensSender");
-    bytes32 constant receivedHash = keccak256("ERC777TokensRecipient");
+    bytes32 constant private SENDHASH = keccak256("ERC777TokensSender");
+    bytes32 constant private RECEIVEDHASH = keccak256("ERC777TokensRecipient");
 
     mapping(address => bool) private _defaultOps;
     mapping(address => mapping(address => bool)) private _revokedDefaultOps;
@@ -203,7 +203,9 @@ contract ERC777Base is IERC777, ERC1820Client {
         require(msg.sender != operator);
         if (_defaultOps[operator]) {
             _reAuthorizeDefaultOperator(operator);
-        } else _authorizeOperator(operator);
+        } else {
+            _authorizeOperator(operator);
+        }
     }
 
     /**
@@ -214,7 +216,9 @@ contract ERC777Base is IERC777, ERC1820Client {
         require(operator != msg.sender);
         if (_defaultOps[operator]) {
             _revokeDefaultOperator(operator);
-        } else _revokeOperator(operator);
+        } else {
+            _revokeOperator(operator);
+        }
     }
 
     /**
@@ -435,7 +439,7 @@ contract ERC777Base is IERC777, ERC1820Client {
     )
     private
     {
-        address implementer = getInterfaceImplementer(from, sendHash);
+        address implementer = getInterfaceImplementer(from, SENDHASH);
         if (implementer != address(0)) {
             IERC777TokensSender(implementer).tokensToSend(
                 operator,
@@ -470,9 +474,9 @@ contract ERC777Base is IERC777, ERC1820Client {
     private
     returns(bool)
     {
-        address implementer = getInterfaceImplementer(to, receivedHash);
+        address implementer = getInterfaceImplementer(to, RECEIVEDHASH);
         if (implementer == address(0)) {
-            return(! to.isContract());
+            return(!to.isContract());
         }
         IERC777TokensRecipient(implementer).tokensReceived(
             operator,
diff --git a/contracts/drafts/ERC777/IERC777.sol b/contracts/drafts/ERC777/IERC777.sol
index 4b6b99bfee3..a1ebd09b1d6 100644
--- a/contracts/drafts/ERC777/IERC777.sol
+++ b/contracts/drafts/ERC777/IERC777.sol
@@ -5,27 +5,10 @@ pragma solidity ^0.5.2;
  * @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-777.md
  */
 interface IERC777 {
-    function name() external view returns (string memory);
-
-    function symbol() external view returns (string memory);
-
-    function totalSupply() external view returns (uint256);
-
-    function balanceOf(address owner) external view returns (uint256);
-
-    function granularity() external view returns (uint256);
-
-    function defaultOperators() external view returns (address[] memory);
-
     function authorizeOperator(address operator) external;
 
     function revokeOperator(address operator) external;
 
-    function isOperatorFor(
-        address operator,
-        address tokenHolder
-    ) external view returns (bool);
-
     function send(address to, uint256 amount, bytes calldata data) external;
 
     function operatorSend(
@@ -45,6 +28,23 @@ interface IERC777 {
         bytes calldata operatorData
     ) external;
 
+    function name() external view returns (string memory);
+
+    function symbol() external view returns (string memory);
+
+    function totalSupply() external view returns (uint256);
+
+    function balanceOf(address owner) external view returns (uint256);
+
+    function granularity() external view returns (uint256);
+
+    function defaultOperators() external view returns (address[] memory);
+
+    function isOperatorFor(
+        address operator,
+        address tokenHolder
+    ) external view returns (bool);
+
     event Sent(
         address indexed operator,
         address indexed from,
diff --git a/contracts/introspection/IERC1820.sol b/contracts/introspection/IERC1820.sol
index 1572e39206e..2e68a3e274d 100644
--- a/contracts/introspection/IERC1820.sol
+++ b/contracts/introspection/IERC1820.sol
@@ -11,29 +11,30 @@ interface IERC1820 {
         address _implementer
     ) external;
 
-    function getInterfaceImplementer(
-        address _addr,
-        bytes32 _interfaceHash
-    ) external view returns (address);
-
     function setManager(
         address _addr,
         address _newManager
     ) external;
 
-    function getManager(address _addr) external view returns(address);
-
-    function interfaceHash(
-        string calldata _interfaceName
-    ) external pure returns(bytes32);
-
     function updateERC165Cache(
         address _contract,
         bytes4 _interfaceId
     ) external;
 
+    function getInterfaceImplementer(
+        address _addr,
+        bytes32 _interfaceHash
+    ) external view returns (address);
+
     function implementsERC165Interface(
         address _contract,
         bytes4 _interfaceId
     ) external view returns (bool);
+
+    function getManager(address _addr) external view returns(address);
+
+    function interfaceHash(
+        string calldata _interfaceName
+    ) external pure returns(bytes32);
+
 }
diff --git a/contracts/mocks/ERC777SenderMock.sol b/contracts/mocks/ERC777SenderMock.sol
index cd63393846f..b6316e54567 100644
--- a/contracts/mocks/ERC777SenderMock.sol
+++ b/contracts/mocks/ERC777SenderMock.sol
@@ -45,6 +45,7 @@ contract ERC777SenderMock is IERC777TokensSender, ERC1820Client {
         uint amount,
         bytes calldata data
     ) external {
+        // solhint-disable-next-line check-send-result
         IERC777(_erc777).send(to, amount, data);
     }
 
diff --git a/test/drafts/ERC777/ERC777.test.js b/test/drafts/ERC777/ERC777.test.js
index 5598d6c7576..fb82b444f2c 100644
--- a/test/drafts/ERC777/ERC777.test.js
+++ b/test/drafts/ERC777/ERC777.test.js
@@ -14,15 +14,16 @@ contract('ERC777', function ([_, holder, operator, anotherAccount]) {
   const USER_DATA = '0xabcd';
   const OPERATOR_DATA = '0x0a0b0c0d';
   const GRANULARITY = '1';
-  var ERC1820Registry;
+  let ERC1820Registry;
 
   before('Deploy ERC1820', function (done) {
+    // eslint-disable-next-line promise/catch-or-return
     ERC1820.at(ERC1820_ADDRESS).then(
-      function(contract) {
+      function (contract) {
         ERC1820Registry = contract.address;
         done();
       },
-      async function(reject) {
+      async function (reject) {
         const address = await ERC1820Deploy(holder);
         ERC1820Registry = (await ERC1820.at(address)).address;
         done();