JavaScript Object and String enhancements. Each depends on Object.implement.

Object.implement.js

!Object.implement && Object.defineProperty(Object.prototype, 'implement', {
  enumerable: false,
  value: function(name, func) {
    !this.prototype[name] && Object.defineProperty(this.prototype, name, {
      enumerable: false,
      value: func
    });
  }
});

Object.implement.sizeof.js

Object.implement('sizeof', function() {
  var counter = 0;
  for (index in this) counter++;
  return counter;
});

String.implement.htmlEntities.js

String.implement('htmlEntities', function() {
  return String(this).replace(/&/g, '&').replace(/>/g, '>').replace(/"/g, '"');
});

String.implement.isHex.js

String.implement('isHex', function() {
  return this.substring(0, 1) == '#' && (this.length == 4 || this.length == 7) && /^[0-9a-fA-F]+$/.test(this.slice(1));
});

String.implement.pxToInt.js

String.implement ('pxToInt', function () {
  return parseInt(this.split('px')[0]);
});

String.implement.reverse.js

String.implement('reverse', function() {
  return this.split('').reverse().join('');
});

String.implement.stripNonAlpha.js

String.implement('stripNonAlpha', function() {
  return this.replace(/[^A-Za-z ]+/g, "");
});

String.implement.stripTags.js

String.implement('stripTags', function() {
  return this.replace(/<\/?[^>]+>/gi, '');
});

String.implement.trim.js

String.implement('trim', function() {
  return this.replace(/^\s*/, "").replace(/\s*$/, "");
});

String.implement.wordCount.js

String.implement('wordCount', function() {
  return this.split(' ').length;
});