what about dynamic variable names?

[markentingh]

for example:

@prefix:"my";
@suffix:"color";

.color(@name, @color){
    @tmp:~"@{prefix}-@{name}-@{suffix}";
    @{tmp}:@color;
}

.color(~"red",#cc0000);

body{background:@my-red-color;}

is something like this possible, where I define a custom variable name "@my-red-color" via a function, then use that custom variable as a property value?

[seven-phases-max]

For the feature-request see #2702 (there were also earlier threads but so far no good use-cases were suggested). From your example it seems like you're just looking for some sort of namespacing, though exact example/pattern would vastly depend on your actual use-case (after all it's not so easy to imagine how .color(~"red", #cc0000); could be better than @my-red-color: #cc0000; and when actually one need to change those prefixes and suffixes w/o actually changing background: @my-red-color;).

So here just a generic minimal namespacing example:

.theme(my) {
    @red:  #c00;
    @blue: #00c;
}

.theme(your) {
    @red:  #933;
    @blue: #339;
}

body {
    .theme(my);
    color:      @red;
    background: @blue;
}

p {
    .theme(your);
    background: @blue;
    // etc.      
}

// etc.

(Related: less/less-meta#12).

[seven-phases-max]

Closing as duplicate of #2702 (I treat this as an FR since the issue tracker is usually not for "How-To"/"Is it possible" type of questions).