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51. What is the purpose of double exclamation?

48. What is promise.all?

45. What are the main rules of promise?

42. What is a Callback Function?

39. What is web storage?

36. What are the differences between cookie, local storage and session storage?

33. What is a post message?

30. How do you reuse information across service worker restarts?

27. What is scope in javascript?

24. What are classes in ES6?