let x = 1 + 2 var y : Int let z : Float = 5.5 let name = "Ben" let msg = "Hello, \( name ) ." print ( name ) var items = [ 1 , 2 , 3 ] items . append ( 4 ) items . removeAtIndex ( 0 ) items . insert ( 10 , atIndex : 0 ) let a = items [ 0 ] var mixed : [ Any ] = [ 1 , false , "a" ] let b = mixed [ 0 ] as! Int let slice = items [ 1 ..< 3 ] for ( index , item ) in items . enumerate () { print ( "Item ( \( index ) ): \( item ) " ) } var menu = [ "queso" : 4.50 , "tacos" : 6.00 , "enchiladas" : 8.95 , "fajitas" : 21.00 ] menu [ "chips" ] = 1.00 menu [ "chips" ] = nil for ( item , price ) in menu { print ( " \( item ) costs \( price ) " ) } let max = 10 for x in 0 ... max { let v = x - max / 2 v * v }