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Booleans in Solidity

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Shlok Kumar
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bool: The possible values are constants - true and false.

Boolean Operators:

  • ! (Logical negation)

  • && (logical conjunction, “and”)

  • || (logical disjunction, “or”)

  • \== (equality)

  • ! = (inequality)

The operators || and && apply the common short-circuiting rules. This means that in the expression f(x) || g(y), if f(x) evaluates to true, g(y) will not be evaluated even if it may have side effects.

Examples:

bool isPaid = true;

Boolean values can be modified within contracts and can be used in both incoming and outgoing parameters and the return value, as shown in the following example:

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.1;

contract BooleanExample {
    bool public myBool;

    function setMyBool(bool myBool) public {
        myBool = myBool;
    }

}

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