Underscore methods that we want to implement on the Collection. - var methods = ['forEach', 'each', 'map', 'reduce', 'reduceRight', 'find', 'detect', - 'filter', 'select', 'reject', 'every', 'all', 'some', 'any', 'include', - 'invoke', 'max', 'min', 'sortBy', 'sortedIndex', 'toArray', 'size', - 'first', 'rest', 'last', 'without', 'indexOf'...