Function overload

You can have multiple definitions for the same function name in the same scope. The definition of the function must differ from each other by the types and/or the number of arguments in the argument list. You cannot overload function declarations that differ only by return type.

Following example shows the concept of a function overloading in Solidity.

Example:- 1

// SPDX-License-Identifier: GPL-3.0
 
pragma solidity >=0.7.0 <0.9.0;
 
contract LearnFunctionOverload {
    function x(bool lightSwitch, uint256 wallet) public pure {
        // do something here
    }
 
    function x(bool lightSwitch) public pure {
        // do something here
    }
}

Example:- 2

// SPDX-License-Identifier: GPL-3.0
 
pragma solidity >=0.7.0 <0.9.0;
 
contract LearnFunctionOverload {
    function x(
        uint256 _nu1,
        uint256 _nu2,
        uint256 _nu3
    ) internal pure returns (uint256) {
        return _nu1 + _nu2 + _nu3;
    }
 
    function x(uint256 _nu1, uint256 _nu2) internal pure returns (uint256) {
        return _nu1 + _nu2;
    }
 
    function callxWith2Parameters() public pure returns (uint256) {
        return x(1, 2);
    }
 
    function callxWith3Parameters() public pure returns (uint256) {
        return x(1, 2, 3);
    }
}

Example:- 3

pragma solidity ^0.5.0;

contract Test {
   function getSum(uint a, uint b) public pure returns(uint){      
      return a + b;
   }
   function getSum(uint a, uint b, uint c) public pure returns(uint){      
      return a + b + c;
   }
   function callSumWithTwoArguments() public pure returns(uint){
      return getSum(1,2);
   }
   function callSumWithThreeArguments() public pure returns(uint){
      return getSum(1,2,3);
   }
}

Run the above program using steps provided in Solidity First Application chapter.

Click callSumWithTwoArguments button first and then callSumWithThreeArguments button to see the result.

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Function overload