LESS - Guard Comparison Operators

Description

LESS contains five guard comparison operators: <, >, <=, >= and =. You can use the comparison operator (=) to compare numbers, strings, identifiers, etc, and the remaining operators can be used only with numbers.

Example

The following example demonstrates the use of guard comparison operators in the LESS file −

<!doctype html>
   <head>
      <title>Guard Comparison Operators</title>
      <link rel = "stylesheet" href = "style.css" type = "text/css" />
   </head>

   <body>
      <h2>Example of Guard Comparison Operators</h2>
      <p class = "myclass">Hello World!!!Welcome to Tutorialspoint...</p>
   </body>
</html>

Next, create the style.less file.

style.less

.mixin (@a) when (@a = 20px){
color:red;
}

.mixin (@a) when (@a < 20px) {
   color:blue;
}

.mixin (@a) {
   font-size: @a;
}

.myclass { .mixin(20px) }

You can compile the style.less to style.css by using the following command −

lessc style.less style.css

Execute the above command; it will create the style.css file automatically with the following code −

style.css

.myclass {
   color: red;
   font-size: 20px;
}

Output

Follow these steps to see how the above code works −

Save the above html code in the guard_comparison_operators.html file.
Open this HTML file in a browser, the following output will get displayed.

less_mixin_guards.htm