Not really next-gen JavaScript, but also important: JavaScript array functions like map() , filter() , reduce() etc.
You’ll see me use them quite a bit since a lot of React concepts rely on working with arrays (in immutable ways).
The following page gives a good overview over the various methods you can use on the array prototype – feel free to click through them and refresh your knowledge as required: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array
Particularly important in this course are:
map()=> https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/mapfind()=> https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/findfindIndex()=> https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/findIndexfilter()=> https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/filterreduce()=> https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/Reduce?v=bconcat()=> https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/concat?v=bslice()=> https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/slicesplice()=> https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/splice
