Question

In my js code I noticed many statements like:

model.set({someAttribute : !model.get("someAttribute")});

So I thought it may be useful to define custom method in the model:

toggle: function(attr, silent){
    this.set({attr: !this.get(attr)}, silent? {silent:true} : {});
}

The problem is, javascript javascript treats ‘attr’ as an actual key name instead of formal function parameter, so the code above doesn’t work. Any suggestions how to solve this problem?
I want an elegant one-line solution.

Answer 1

there isn’t an elegant one-line solution for this. in order to use attr as the key, you have to declare the object literal and then set it using the [] syntax:

toggle: function(attr, silent){
  var data = {}, value = this.get(attr);
  data[attr] = !value;
  this.set(data, {silent: silent});
}