Es2016

before es2016 to find out if a value is present in a array

const  arr = [1, 2, 3, 4, 5, 6, 7, 9]

  if(arr.indexOf(2) > 1){
    console.log('Number found')
  } else {
    console.log('Number not found')
  }

after es2016

 const arr = [1, 2, 3, 4, 5, 6, 7, 8]

  if(arr.include(2)) {
    console.log('Number found')
  } else {
    console.log('Number not found')
  }

to calculate a exponentiation

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before

  Math.pow(7, 2)

after

 7 ** 2