Updates from the 91st TC39 meeting

#javascript

There were several items on the agenda, this post focuses on feature proposals and their progress from the meeting that was held between 19-21st July 2022.

Stage 4:

Hashbang Grammar: match de-facto usage in some CLI JS hosts that allow for #! Shebangs / Hashbang.

Stage 3:

Duplicate named capturing groups: allow regex capturing group names to be repeated.

Stage 2:

Import Reflection: Proposal for syntax to import ES modules with import reflection attributes.

Stage 1:

Symbol Predicates: proposal to introduce ways to differentiate symbols.
Policy Maps and Sets: proposal for Maps and Sets with cache replacement policies like LRU and LFU.
Function Memoization: Function memoization.
Object pick/omit: Ergonomic Dynamic Object Restructuring.

Extra:

This meeting was conducted in Google SF and below is the lunch time view!