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bterlson's profile
brian 🇨🇦 node+js interactive 🍁
brian 🇨🇦 node+js interactive 🍁
brian  🇨🇦 node+js interactive  🍁
@bterlson

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brian  🇨🇦 node+js interactive  🍁

@bterlson

JavaScript, TypeScript, Azure, editor of the ECMAScript standard. Microsoft employee but my opinions are my own. http://pronoun.is/he 

Seattle
github.com/bterlson
Joined November 2013

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    1. George Yong‏ @geoyws Mar 22

      @DasSurma (wonder if you might wanna help answer this question) Why did TC39 decide to not give new Map() indexes? https://stackoverflow.com/questions/37822141/how-do-you-get-the-key-at-specifc-index-in-javascript-map-object … Right now we have to loop through the Map to get the index of a key.

      1 reply 0 retweets 1 like
    2. Surma‏ @DasSurma Mar 22
      Replying to @geoyws

      I don’t think maps are spec’d to be ordered. The implementation _might_ be, but there’s no guarantee. Why are you using a map if you want to access by index? cc @mathias

      2 replies 0 retweets 2 likes
    3. Mathias Bynens‏Verified account @mathias Mar 22
      Replying to @DasSurma @geoyws

      Maps (and sets) are indeed unordered. If the order matters, use an array instead.

      2 replies 0 retweets 0 likes
    4. brian  🇨🇦 node+js interactive  🍁‏ @bterlson Mar 22
      Replying to @mathias @DasSurma @geoyws

      I believe ES sets and maps are ordered in insertion order. It's not explicitly specified, but the specification device uses a List which implies an ordering.

      2 replies 0 retweets 2 likes
    5. Mathias Bynens‏Verified account @mathias Mar 22
      Replying to @bterlson @DasSurma @geoyws

      If ordering matters, then maps or sets are conceptually the wrong data structure. My mental model is that maps contain a pile of key/value pairs, and sets contain a pile of values. This is also why maps/sets get a `size` rather than a `length`. Length implies an inherent order.

      3 replies 0 retweets 0 likes
    6. Domenic Denicola‏ @domenic Mar 22
      Replying to @mathias @bterlson and

      While this may be true in general of maps/sets, it's not right for JS Maps/Sets. They work great when ordering matters. And the mental model should be an ordered list of pairs, not a pile.

      2 replies 0 retweets 4 likes
    7. Surma‏ @DasSurma Mar 22
      Replying to @domenic @mathias and

      Interesting. Something we should be more explicit/vocal about imo. When I hear Set/Map, I don’t assume ordering.

      2 replies 0 retweets 1 like
      brian  🇨🇦 node+js interactive  🍁‏ @bterlson Mar 22
      Replying to @DasSurma @domenic and

      Agree. The spec is arguably misleading too when it says "Map object must be implemented using either hash tables or other mechanisms that" since types explicitly called hash tables are not ordered IME.

      3:39 AM - 22 Mar 2018
      • 1 Like
      • Mathias Bynens
      0 replies 0 retweets 1 like

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