var users = [ { 'user': 'barney', 'age': 36 }, { 'user': 'fred', 'age': 40 } ];
// A sequence without explicit chaining. _(users).head(); // => { 'user': 'barney', 'age': 36 }
// A sequence with explicit chaining. _(users) .chain() .head() .pick('user') .value(); // => { 'user': 'barney' }