Sass if - CSS

CSS preprocessors have become quite popular in recent years. Sass is one such preprocessor that allows you to write more efficient and maintainable CSS code. Sass includes a number of useful features, one of them being the if directive.

What is the Sass if directive?

The Sass if directive provides a way to write conditional statements in Sass. The syntax for the directive is as follows:

@if condition {
  // Code to execute if the condition is true
} @else if condition2 {
  // Code to execute if condition2 is true
} @else {
  // Code to execute if both condition and condition2 are false
}

Example usage

Let us consider a simple example to understand how to use the Sass if directive. Suppose you want to create a button that changes color when it is hovered over. You could write the following Sass code:

$default-color: blue;
$hover-color: green;

button {
  background-color: $default-color;

  &:hover {
    background-color: $hover-color;
  }
}

This would output the following CSS:

button {
  background-color: blue;
}

button:hover {
  background-color: green;
}

Now, if you want the hover color to be the same as the default color if it is not specified explicitly, you could modify the code as follows:

$default-color: blue;
$hover-color: null;

button {
  background-color: $default-color;

  @if $hover-color != null {
    &:hover {
      background-color: $hover-color;
    }
  } @else {
    &:hover {
      background-color: $default-color;
    }
  }
}

This would output the following CSS:

button {
  background-color: blue;
}

button:hover {
  background-color: blue;
}

Conclusion

The Sass if directive provides a convenient way to write conditional statements in Sass. It can be useful for creating more flexible and maintainable CSS code.