JavaScript Extensions MCQ

Test your knowledge with important JavaScript Extensions MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more JavaScript Extensions MCQs at Bissoy

• Which method of the iterable object returns an iterator object for the collection?
  ক

  iterator()

  খ

  _iterator_()

  গ

  _iteration_()

  ঘ

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

  Exit Iteration

  খ

  Abort Iteration

  গ

  Abort

  ঘ

  Stop Iteration
• Which looping statement allows XML tags to appear in JavaScript programs and adds API for operating on XML data?
  ক

  for loop

  খ

  while loop

  গ

  for/each loop

  ঘ

  do while loop
• The main difference between the variables declared with var and with let is __________
  ক

  var is confined to a particular function but let is not

  খ

  let is confined to a particular function but var is not

  গ

  var defines values based on conditions but let does not

  ঘ

  let doesn’t let you change the value of the variable
• The let keyword cannot be used ___________
  ক

  as a substitute of var

  খ

  as a block statement to define new variables

  গ

  to define variables that are scoped to a single expression

  ঘ

  in a else if loop, as a substitute for var