Casperjs bind polyfill

gistfile1.js

/** 
 * CasperJS .bind()
 * 
 * Adds .bind() capability missing from PhantomJS < 2.0.0 for CasperJS.
 * Needed for some types of evaluations on the remote page as well as
 * screenshots.
 */
casper.on('page.initialized', function() {
  casper.evaluate(function() {
    var isFunction = function(o) {
      return typeof o == 'function';
    };

    var bind;
    var slice = [].slice;
    var proto = Function.prototype;
    var featureMap;

    featureMap = {
      'function-bind': 'bind'
    };

    function has(feature) {
      var prop = featureMap[feature];
      return isFunction(proto[prop]);
    }

    if (!has('function-bind')) {
      bind = function bind(obj) {
        var args = slice.call(arguments, 1);
        var self = this;
        var nop = function() {};
        var bound = function() {
          return self.apply(this instanceof nop ? this : (obj || {}), args.concat(slice.call(arguments)));
        };
        nop.prototype = this.prototype || {};
        bound.prototype = new nop();
        return bound;
      };
      proto.bind = bind;
    }
  });
});