Question

Here is a really lame example of what I am trying to do. This piece of code works.

var Love = {
  name: 'Johnny',
  kiss: function (girl){
    alert(this.name + " kissed " + girl );
  }
};

Love.name = "Chris";
Love.kiss("Becky");

I first reassigned the property of name, and then called the method sending my parameter

What I would really like to do, is use JSON to set the “name” property while calling the method. I swear I’ve seen it done somewhere, but I can’t figure it out. So ideally it would look something like this.

Love.kiss({
  name: 'Chris'},
  "Becky");

Or even something like this.

var Love = {
  Guy: 'Johnny',
  Girl: 'Mallory',
  kiss: function (){
    alert(this.Guy + " kissed " + this.girl);
  }
};

Love.kiss({
  Guy: 'Chris',
  Girl; 'Becky'});

Again, I know this is a really stupid example, but the concept has a certain application that I would like to use.

Answer 1

Just run through the keys of the object you pass in as an argument and assign them to this:

var Love = {
    Guy: 'Johnny',
    Girl: 'Mallory',
    kiss: function(opts) {
        for (var k in opts) {
            this[k] = opts[k];
        }
        alert(this.Guy + " kissed " + this.Girl);
    }
};

Love.kiss({
    Guy: 'Chris',
    Girl: 'Becky'
});​  // -> alert('Chris kissed Becky')

See demo