Javascript

• map() and filter()
• slice() and splice()
• concat()
• find() and findIndex()
• destruction
  • unpacking (assigning) values from arrays or object properties directly into variables
• rest and spread operator
  • rest parameter enables us to pass unspecified number of parameter to a function which will be placed into array, while the spread content of a iterable into individual elements
• promises
  • handle asynchronous operations,
  • pending
  • fulfilled
  • rejected