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Lesson 13:
Conditional Statements
Introduction to Conditional Statements (if/else) and how to use it in your smart contracts.
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Conditional Statements
If/Else
Conditional statements in Solidity work similarly to other programming languages, allowing you to execute different code blocks based on certain conditions.
The if statement is used to specify a block of code to be executed if a specified condition is true. The else statement is used to specify a block of code to be executed if the same condition is false.
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;
contract IfElse {
// This function demonstrates the use of if/else conditional statements in Solidity.
// The function takes an input 'x' and returns a value based on the condition that 'x' satisfies.
function foo(uint256 x) public pure returns (uint256) {
if (x < 10) {
return 0; // Return 0 if x is less than 10
} else if (x < 20) {
return 1; // Return 1 if x is greater than or equal to 10 but less than 20
} else {
return 2; // Return 2 if x is greater than or equal to 20
}
}
// Below is ternary operator in Solidity, which is a shorthand way to write if/else statements.
function ternary(uint256 _x) public pure returns (uint256) {
return _x < 10 ? 1 : 2;
}
// use of multiple conditions in an if/else statement using logical operators.
function multipleConditions(uint256 a, uint256 b) public pure returns (uint256) {
if (a > b && a < 20) {
return 1;
} else if (a <= b || a >= 20) {
return 2;
}
}
}