Simple model class

models.js

var A = function (props) {
  this.properties = props;
  this.constructor.addModel(this);
};

A.models = [];

A.addModel = function (model) {
  model.properties.id = this.models.length + 1;
  this.models.push(model);
};

A.all = function () {
  return this.models;
};

A.where = function (props) {
  return this.models.filter(function (model) {
    for (var prop in props) {
      if (model.properties[prop] != props[prop]) return false;
    }
    return true;
  });
};

A.find = function (id) {
  return this.where({id: id});
};