LESS does not natively support an `if` statement, but we can achieve conditional logic through alternative methods. One common approach is to use the `when` keyword in conjunction with guard clauses for conditional compilation. This approach enables us to apply different style rules based on conditions. Here is an example demonstrating how to use this technique:

```less
// Define variable
@isDarkTheme: true;

// Define mixin to implement conditional logic
.theme(@isDark) when (@isDark = true) {
  background-color: #333; // Dark theme background
}

.theme(@isDark) when (@isDark = false) {
  background-color: #FFF; // Light theme background
}

// Use mixin
.container {
  .theme(@isDarkTheme); // Apply appropriate background color based on @isDarkTheme
}
```

In the above example, we define a variable `@isDarkTheme` and a mixin named `.theme`. This mixin contains two parts, each with a `when` condition. Based on the value of `@isDarkTheme`, it selects the appropriate code block to execute, thereby applying the corresponding background color.

While this is not a traditional `if` statement, it provides a powerful tool for implementing conditional logic in LESS. With this logic, we can flexibly apply styles based on different conditions, enhancing the maintainability and dynamism of our CSS code.

How to use if statements in LESS

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