Pure computed

pure_computed.js

  pure(...args) {
    const f = args.pop();
    return Ember.computed(...args, function() {
      const values = args.map(arg => {
        if (arg.match(/@each/)) {
          const segments = arg.split('.@each.');
          return this.get(segments[0]).map(v => v.get(segments[1]));
        } else if (arg.match(/\[\]/)) {
          const segments = arg.split('.[]');
          return this.get(segments[0]);
        } else {
          return this.get(arg);
        }
      });
      return f(...values);
    });
  }