lib/functions/math.js
function math(n, fn){
  utils.assertType(n, 'unit', 'n');
  utils.assertString(fn, 'fn');
  return new nodes.Unit(Math[fn.string](n.val), n.type);
}
function math(n, fn){
  utils.assertType(n, 'unit', 'n');
  utils.assertString(fn, 'fn');
  return new nodes.Unit(Math[fn.string](n.val), n.type);
}
function math ( n , fn ) { utils . assertType ( n , 'unit' , 'n' ) ; utils . assertString ( fn , 'fn' ) ; return new nodes . Unit ( Math [ fn . string ] ( n . val ) , n . type ) ; }
Apply Math `fn` to `n`.

@param {Unit} n
@param {String} fn
@return {Unit}
@api private
Apply Math fn to n .