In this episode of Syntax, Scott and Wes talk about all the new stuff in ES2022 — what it is, why you might need it, and how to use it.Sanity - Sponsor
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04:50 - Regex indicies
- New d flag in a regex
- This will tell you the indexes (indicies) of the regex matches
- Handy if you need to highlight or replaces matches in a string
- We can ask for the start and end positions of each matched capture group
07:16 - Class updates
- Private fields
- Properties and Methods to be kept private
- Prefix them with a #
- =Helpful for internal state and methods which should not be accessed directly or at all by external
- In React how we have __INTERNTAL_NEVER USE THIS
- Getters and setters introduced in es5
09:07 - Class fields
- This may seem super old because we have been polyfilling it forever
- Right now if you want an instance field on a class, you need to declare it in the constructor
- Now we can just declare them inside the class
10:36 - Static fields and methods
- As above can also be static with the static keyboard
- Works for methods too
- Explain what a static method is
13:17 - Top level await
- So handy in modules. Need to pull in some data? Simple.
15:19 - Ergonomic brand checks for private fields
- Used for checking if a private field on a class exists using the in keyword
16:00 - .at() method
- Strings and arrays - we can use square brackets to reference items of the array
- Super handy for grabbing the last item of an array
- Why not use array[-1]?
- We used to use slice(-1)
- What about indexOf?
21:34 - Handy hasOwn method
24:51 - Class static block
- A static block allows you to run code before creating an optional static property during initialization
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