There are several ways to return outputs from a function.
Public functions cannot accept certain data types as inputs or outputs
// SPDX-License-Identifier: MIT
pragma solidity ^0.7.6;
contract Function {
// Functions can return multiple values.
function returnMany() public pure returns (uint, bool, uint) {
return (1, true, 2);
}
// Return values can be named.
function named() public pure returns (uint x, bool b, uint y) {
return (1, true, 2);
}
// Return values can be assigned to their name.
// In this case the return statement can be omitted.
function assigned() public pure returns (uint x, bool b, uint y) {
x = 1;
b = true;
y = 2;
}
// Use destructing assignment when calling another
// function that returns multiple values.
function destructingAssigments()
public pure returns (uint, bool, uint, uint, uint)
{
(uint i, bool b, uint j) = returnMany();
// Values can be left out.
(uint x, , uint y) = (4, 5, 6);
return (i, b, j, x, y);
}
// Cannot use map for neither input nor output
// Can use array for input
function arrayInput(uint[] memory _arr) public {
}
// Can use array for output
uint[] public arr;
function arrayOutput() public view returns (uint[] memory) {
return arr;
}
}
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