code: function chain(fnAfter, fnBefore) {
  			if (!fnBefore) {
  				return fnAfter;
  			}
  
  			function formatter() {
  				return fnAfter.call(this, fnBefore.apply(this, arguments));
  			}
  			return formatter;
  		}
docs: Returns a function representing the composition <code>fnAfter</code> after
  <code>fnBefore</code>.
  
  @param {function} fnAfter
  the second function, taking a single argument
  @param {function} [fnBefore]
  the optional first function, taking multiple arguments
  @returns {function}
  the composition <code>fnAfter</code> after <code>fnBefore</code>