Gist from mistakes.io

index.js

function extend(obj) {
  var args = Array.prototype.slice.call(arguments, 1);
  args.forEach(function(item, ix, arr) {
    for (prop in item) {
      obj[prop] = item[prop];
    }
  })
  return obj;
}

data = {};
obj1 = {
  name: 'obj1',
  value: 25,
  multiply: function() {
    return this.value * 2;
  }
}

extend(data, obj1)

data.multiply()