nsstring - Method and Property chaining calls in Swift -


i have been trying understand concept of method chaining in programming i'm little confused. far able call multiple function same class returning self.

can explain , possibly put quick example on how can call method 1 class , property different class? i'm interested in implementation.

for instance following code demonstrates how method numberfromstring() nsnumberformatterclass called property doublevalue nsstring class called on same line.

var mystring = "123"  var mydouble = nsnumberformatter().numberfromstring(mystring)!.doublevalue

can please me understand concept putting quick example similar above code.

thanks

doublevalue in case being called on instance of nsnumber, return type of numberfromstring: method of nsnumberformatter. nsstring has same property.

var mystring = "123"  var mynumber = nsnumberformatter().numberfromstring(mystring)!  var mydouble = mynumber.doublevalue

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