Sort with multiple comparators

sort.groovy

List list = [
    [id:0, firstName: 'Sachin', lastName: 'Tendulkar', age: 40 ],
    [id:1, firstName: 'Sachin', lastName: 'Tendulkar', age: 103 ],
    [id:2, firstName: 'Ajay', lastName: 'Tendulkar', age: 48 ],
    [id:3, firstName: 'Virendra', lastName: 'Sehwag', age: 5 ],
    [id:4, firstName: 'Virendra', lastName: 'Sehwag', age: 50 ],
    [id:5, firstName: 'Sachin', lastName: 'Nayyar', age: 15 ]
]

Collection.metaClass.sort = { boolean mutate, Closure... closures ->
  delegate.sort( mutate ) { a, b ->
    closures.findResult { c -> c( a ) <=> c( b ) ?: null }
  }
}

list.sort( false, { it.firstName }, { it.lastName }, { it.age } )*.id

Nice. Happy to see that you have used Indian Cricket players :D