snippets.js

var unique = function(array) {
  return array.reduce(function(memo, elem) {
    if (memo.indexOf(elem) < 0) memo.push(elem);
    return memo;
  }, []);
};

// Example
//
//   var callback = function(error, data) {console.log('Done.', error, data);};
//   ajax('url', callback);
//   ajax('url', 'data', callback);
//   ajax({url: 'url', method: 'PATCH', data: 'data'}, callback);
//
var ajax = function(url, data, callback) {
  var params = {};
  if (typeof url === 'object') {
    params = url;
  } else {
    params.url = url;
    if (typeof data === 'object') {
      params.method = 'POST';
    } else {
      callback = data;
    }
  }

  if (params.method == null) params.method = 'GET';
  if (callback == null) callback = Function.prototype;

  var xhr = new XMLHttpRequest();
  xhr.onreadystatechange = function() {
    if (xhr.readyState === 4) callback(xhr.responseText);
  };
  xhr.open(params.method, params.url, true);
  xhr.send(params.data);
};


// Extends the object with properties from another objects.
// Example
// 
//   extend({a: 5, b: 10}, {b: 15, c: 20, e: 50})
//   # => {a: 5, b: 15, c: 20, e: 50}
// 
var extend = function() {
  var result = {};
  var objects = [].slice.call(arguments);

  objects.forEach(object) {
    Object.keys(object).forEach(function(key) {
      result[key] = object[key]
    });
  };

  return result;
};