goodies/index.js

Native object extension goodies.

var extend = function(object, methodName, method) {
  if (!object.prototype[methodName]) {
    Object.defineProperty(object.prototype, methodName, {
      enumerable: false,
      value: method
    });
  }
};

extend(Array, "bsearch", function(value, compare) {
  var arr = this
    , hi = arr.length - 1
    , lo = 0
    , pos
    , dir
    , compare;

  compare = compare || function(a, b) { return a - b };
  while (lo <= hi) {
    pos = (hi - lo)/2 + lo;
    pos = Math.floor(pos);
    dir = compare(arr[pos], value);
    if (dir > 0) {
      hi = pos - 1;
    } else if (dir < 0) {
      lo = pos + 1;
    } else {
      return pos;
    }
  }
  return -1;
});

extend(Array, "unique", function() {
  for (var i = 1; i < this.length; ++i) {
    if (this[i] == this[i - 1]) {
      this.splice(i, 1);
      --i;
    }
  }
  return this;
});

extend(Array, "last", function() {
  return this[this.length - 1];
});

extend(Object, "join", function(object) {
  var objectA = object
    , objectB = this
    , merged = {}
    , keysA = Object.keys(objectA)
    , keysB = Object.keys(objectB)
    , keys = keysA.concat(keysB).sort().unique()
    , key;
  for (var i = 0, l = keys.length; i < l; ++i) {
    key = keys[i];
    if (objectA.hasOwnProperty(key) && objectB.hasOwnProperty(key)) {
      if (typeof objectA[key] === "object" && typeof objectB[key] === "object") {
        merged[key] = objectB[key].merge(objectA[key]);
      } else {
        merged[key] = objectA[key];
      }
    } else if (objectA.hasOwnProperty(key)) {
      merged[key] = objectA[key];
    } else if (objectB.hasOwnProperty(key)) {
      merged[key] = objectB[key];
    }
  }
  return merged;
});

extend(Date, "unixTime", function() {
  return Math.floor(this.getTime()/1000);
});

extend(Date, "fromUnixTime", function(time) {
  this.setTime(time*1000);
});