5 ms·

I just don't see how JWalk.getString(user, "them", "public_keys", "primary", "bundle"); is better than user.them.public_keys.primary.bundle What am I mi

• EvilTrout 13y ago
  What if them is `undefined`? You'll get an exception when usually you just want `undefined` as the answer. As a side note, Ember.js has a nice method for this built in, that works on plain old Javascript objects as well as the heavier Ember ones: Em.get(obj, 'user.them.public_keys.primary.bundle')
  • gcb0 13y ago
    try{} ?
• timbray 13y ago
  In Ruby or Python or JS, you should be able to do the user.them... form. In a statically typed language like Java or Go it’s harder, and I happened to be working on an Android app, thus Java.
• currywurst 13y ago
  Not blowing up when one part of the chain goes "undefined"
• tel 13y ago
  Failure semantics are the obvious ones. At the very least you'll need some flavor of try { user.them.public_keys.primary.bundle } rescue { OhDamn } Less obvious is the potential for multiple targets. JWalk probably doesn't do this, but it could. For more ideas for how this could work take a look at http://research.microsoft.com/pubs/77415/theessenceofdataaccessincw(ecoop2005).pdf http://research.microsoft.com/pubs/77415/theessenceofdataacc...
• vinkelhake 13y ago
  That JWalk library is in Java so there won't be something you can use dynamically like that.
  • Zelphyr 13y ago
    AH! That's the missing piece for me. I thought this was all in JS.
  • jayd16 13y ago
    You can use GSON and just parse your objects into POJOs and access them with dot notation. In fact, now that I think about it, I wonder if you can rig up your POJOs as Java 8 Option<> and remove some of the null checking. I'll have to look into that.
    • tel 13y ago
      That's a good place to start. Basing it on the list monad instead of the option monad gives you traversals with monoidal summaries.