For AI agents: the complete documentation index is available at /tc39-atlas/en/llms.txt, the full documentation bundle is available at /tc39-atlas/en/llms-full.txt, and this page is available as Markdown at /tc39-atlas/en/proposals/proposal-setmap-offrom.md.
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      • of and from on collection constructors S1

      Proposal details
      Proposal overview

      This proposal aims to add static of and from methods to collection constructors (like Set and Map). It is motivated by Brendan Eich's tweet about functionality parity with arrays.

      Note

      The README below comes from the upstream repository and may contain outdated stage or status metadata. Use the proposal details above as the current source of truth.

      of and from on collection constructors

      Champions

      • Kevin Gibbons
      • Allen Wirfs-Brock
      • Leo Balter

      Status

      This proposal is currently stage 1 of the TC39 process.

      Motivation

      https://twitter.com/BrendanEich/status/771009446298329088

      Questions

      https://github.com/tc39/proposal-setmap-offrom/issues

      Polyfill

      A polyfill is available in the core-js library. You can find it in the ECMAScript proposals section.