Updates from the 90th TC39 meeting
source link: https://dev.to/hemanth/updates-from-the-90th-tc39-meeting-1789
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There were several items on the agenda, this post focuses on feature proposals and their progress from the meeting that was held between 6-9th June 2022.
Stage 4:
Array find from last: Proposal for .findLast() and .findLastIndex() methods on array and typed array.
Stage 3:
Symbols as WeakMap keys: Permit Symbols as keys in WeakMaps, entries in WeakSets and WeakRefs, and registered in FinalizationRegistries
Stage 2:
String.dedent: For multi-backtick templates with automatic margin stripping.
Duplicate named capture groups:Allow regex capturing group names to be repeated.
JSON.parse source text access: Extending JSON.parse to expose input source text.
Stage 1:
Faster Promise adoption: Reduce the number of microtask ticks required to adopt the state of a promise
RegExp Atomic Operators: Syntax to regular expressions to control backtracking in certain scenarios by treating certain portions of a pattern as "atomic", where backtracking information specific to that portion of the pattern is discarded when it matches successfully.
More updates:
Array#groupBy is renamed to Array#group, but why? Read on
Tried renaming it on Firefox:
@gnumanth
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