Using variables in property names in LESS (dynamic properties / property name interpolation)

LESS doesn't currently support dynamically inserted properties, despite some discussions on the topic on Stack Overflow.

Workaround #1: Inject Dynamically Generated Properties into Property Value

This workaround injects dynamically created properties into a hard-coded property value:

.vendors(@property, @value, @pre: ect) {
  -inj:~"@{pre}; -webkit-@{property}: @{value}; -moz-@{property}: @{value}; -ms-@{property}: @{value}; -o-@{property}: @{value}; @{property}: @{value}";
}

Workaround #2: Inject Dynamically Generated Properties into the Name of the Following Class (LESS

This workaround constructs a virtual class or ruleset that includes the vendors and recursively builds the next class:

.vendors(@property, @value, @rest:"") {
  @inject:~"@{rest} -webkit-@{property}: @{value}; -moz-@{property}: @{value}; -ms-@{property}: @{value}; -o-@{property}: @{value}; @{property}: @{value};";
}

.test(@nextclass){
  .vendors(transform, "matrix(2,0,0,2,20,20)");
  .vendors(transform-origin,"10px 10px", @inject);
  (~"{@{inject}} .@{nextclass}"){/*next class properties*/};
}

Workaround #3: Inject Dynamically Generated Properties into the Name of the Following Class (LESS 1.4.0 )

This version uses recursion to overcome limitations in LESS 1.4.0:

@nl: `"\n\t"`;

.multi(@props,@vals,@i,@inj) {
  @property: extract(@props, 1);
  @value: extract(@vals, 1);
  @inject:~"@{inj}@{nl}-webkit-@{property}: @{value};@{nl}-moz-@{property}: @{value};@{nl}-ms-@{property}: @{value};@{nl}-o-@{property}: @{value};@{nl}@{property}: @{value};";
}

.multi(@props,@vals,@i,@inj:"") when (@i > 0) {
  @property: extract(@props, @i);
  @value: extract(@vals, @i);
  @injnext:~"@{inj}@{nl}-webkit-@{property}: @{value};@{nl}-moz-@{property}: @{value};@{nl}-ms-@{property}: @{value};@{nl}-o-@{property}: @{value};@{nl}@{property}: @{value};";
  .multi(@props,@vals,(@i - 1),@injnext);
}

In LESS versions 1.6 and above, property name interpolation is implemented natively, so no workarounds are needed.