ios - Complements / intersection of two generic array filled with NSIndexPath -

ipstoreload.filter { !contains(self.ipstoinsert, {$0.row == $1.row}) }

i want expression work. need complements of 2 generic array: ipstoreload \ ipstoinsert. idea doing wrong?

this definition:

var ipstoinsert = [nsindexpath]() var ipstodelete = [nsindexpath]() 

the trouble have 2 nested closure expressions (the 1 filter, , 1 contains). within closure expression, $0 , $1 refer arguments local closure expression – in case, writing expression contains takes 2 arguments ($0 , $1), , closure argument filter looks if takes no arguments (hence swift complaining can't pass ()->_ argument filter).

try naming arguments, so:

ipstoreload.filter { reload in      !contains(ipstoinsert) { insert in          reload.row == insert.row      }  }