56.
Which looping statement allows XML tags to appear in JavaScript programs and adds API for operating on XML data?

57.
Which exception does the Iterators throw from their next() method when there are no more values to iterate, that work on finite collections ?

58.
Which method of the iterable object returns an iterator object for the collection?

59.
Consider the following code snippet
let succ = function(x) x+1, yes = function() true, no = function() false;
What convenience does the above code snippet provide?

60.
Consider the following code snippet
data.sort(function(a,b),b-a);
What does the above code do?