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Allen Wirfs Brock Presentation Es5 Panel
 

Allen Wirfs Brock Presentation Es5 Panel

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    Allen Wirfs Brock Presentation Es5 Panel Allen Wirfs Brock Presentation Es5 Panel Presentation Transcript

    • ES5: ECMAScript Standards for a Better Web Panelists: Allen Wirfs-Brock, Microsoft (Moderator) Brendan Eich, Mozilla Douglas Crockford, Yahoo! Mark S. Miller, Google
      • Final Document will be approved by TC39 next week.
      • Ratification as official standard at December ECMA General Assembly meeting.
      ECMAScript 5 is Finished!
    • What’s new in ES5
      • Enhanced Object Model & Reflection API
        • Getter/Setter Properties
        • Configurable Attributes
          • Enumerable, Writable, Configurable
        • Sealed/Frozen Objects
        • Property Interrogation
        • Object.create(proto,…)
      • Technical Corrections
        • Readonly NaN, undefined,etc.
        • arguments is enumerable
        • Array.prototype fully generic
        • Etc. Etc…
      • Strict Mode
        • Enhanced Error Checking
        • Tamed global object access
        • Private eval scopes
      • Native JSON
      • Library Enhancements
        • “ Array Extras” + reduce[Right]
        • String trim
        • Function bind
        • Date ISO string format
    • What Does ECMA TC39 Actually Do?
      • Codify successful browser/community innovation
        • Mozilla “Array Extras”
      • Polish promising innovations
        • json2.js  ES5 JSON support
      • Synthesize from browser experiments & user requirements
        • __defineSetter__ + framework builder needs  ES5 Object Model enhancements and Reflection API
      • Invent when necessary to solve real world problems
        • Security & usability concerns  ES5 Strict Mode
    • What’s Next: ECMAScript “Harmony”
      • Be a better language for writing:
        • complex applications;
        • libraries (possibly including the DOM) shared by those applications;
        • code generators targeting the new edition.
      • Switch to a testable specification, ideally a definitional interpreter hosted mostly in ES5.
      • Improve interoperation, adopting de facto standards where possible.
      • Keep versioning as simple and linear as possible.
      • Support a statically verifiable, object-capability secure subset.
      Goals
      • New features require concrete demonstrations.
      • Keep the language pleasant for casual developers.
      • Preserve the “start small and iteratively prototype” nature of the language.
      Requirements
      • Minimize the additional semantic state needed beyond ES5.
      • Provide syntactic conveniences for:
        • good abstraction patterns;
        • high integrity patterns;
        • defined by desugaring into kernel semantics.
      • Remove (via opt-in versioning or pragmas) confusing or troublesome constructs: Consider building on ES5 strict.
      • Support virtualizability, for host object emulation
      Means 10 Year Release Cycle
    • Panel Q&A? Panelists/ECMA TC39 Member Representatives: Allen Wirfs-Brock, Microsoft (Moderator) Brendan Eich, Mozilla Douglas Crockford, Yahoo! Mark S. Miller, Google
    • Please complete an evaluation.