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    <h2>1:</h2> <p>In general, when you need to generate different things for different number of arguments passed you don't need to use default argument values at all, e.g.:</p> <pre><code>.margin(@top, @bottom, @right, @left) { /* right and left are passed */ } .margin(@top, @bottom) { /* right and left are not passed */ } .margin() { /* no arguments passed */ } // etc. </code></pre> <p>Note that each of these mixins can reuse the others, for example <code>.margin(@top, @bottom)</code> can do something special for the "no right and left case" and then call <code>.margin(@top, @bottom, 0, 0)</code> to perform the main job.</p> <h2>2:</h2> <p>But if you still need these defaults for some reason you can use some special default value that can't be a valid margin, e.g. something like this:</p> <pre><code>.margin(@top: undefined, @bottom: undefined, @right: undefined, @left: undefined) { .test-args(); .test-args() when (@right = undefined) { /* right is not passed */ } .test-args() when (@left = undefined) { /* left is not passed */ } .test-args() when not(@right = undefined) and not(@left = undefined) { /* right and left are passed */ } // etc. } </code></pre> <h2>3:</h2> <p>And the third option would be to use variadic arguments and test their count, but this one is the most verbose and dumb I guess:</p> <pre><code>.margin(@args...) { .eval-args(length(@args)); // requires LESS 1.5.+ .eval-args(@nargs) { // default values: @top: not passed; @bottom: not passed; @right: not passed; @left: not passed; } .eval-args(@nargs) when (@nargs &gt; 0) { @top: extract(@args, 1); } .eval-args(@nargs) when (@nargs &gt; 1) { @bottom: extract(@args, 2); } .eval-args(@nargs) when (@nargs &gt; 2) { @right: extract(@args, 3); } .eval-args(@nargs) when (@nargs &gt; 3) { @left: extract(@args, 4); } args: @top, @bottom, @right, @left; } </code></pre> <p>Though it may probably have its pros in some special use-cases.</p>
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    1. COThank you method 2 suite fine for me!
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