ES7 features you should be using

Gagandeep Singh
Array includes() method The old way to check if some value is present inside an array was to use Array’s indexOf() method. IndexOf() returned -1 if element is not found or else the position of element if it’s present in the array. Exponential operator Similar to Math.pow(), the exponential operator ** was introduced in ES2016. It returns the first argument raised to the power of second argument.