anchor.diff:  		assertEquals(_.flatten(result), [1,2,1,2], 'initial works with _.map');		
   	}
   	
  -	public void function testArraysLast() {
  +	public void function testLast() {
   		var lastWrapper = function (x) { return _.last(x); };
   		assertEquals(_.last([1,2,3]), 3, 'can pull out the last element of an array');
   		assertEquals(_.last([1,2,3], 0), [], 'can pass an index to last');
  
positive.code: 		assertEquals(_.flatten(result), [2,3,2,3], 'works well with _.map');		
  	}
  	
  	public void function testArraysInitial() {
  		var initialWrapper = function (x) { return _.initial(x); };
  		assertEquals(_.initial([1,2,3,4,5]), [1, 2, 3, 4], 'working initial()');
  		assertEquals(_.initial([1,2,3,4],2), [1, 2], 'initial can take an index');
  
negative.code: 	    assertEquals(result, [3, 4], 'takes the difference of three arrays');
  	}
  	
  	public void function testZip() {
  	    var names = ['moe', 'larry', 'curly'];
  	    var ages = [30, 40, 50];
  	    var leaders = [true];
  