mustache.js/examples/view_partial.js

var partial_context = {
  greeting: function() {
    return "Welcome";
  },

  farewell: function() {
    return "Fair enough, right?";
  },

  partial: {
    name: "Chris",
    value: 10000,
    taxed_value: function() {
      return this.value - (this.value * 0.4);
    },
    in_ca: true
  }
};