Safe forEach in JavaScript

safeForEach.js

Array.prototype.safeForEach = function ( fn ) {
  var len = this.length;
  for ( var cur = 0, cur < len; ++cur ) {
    for ( var i = 0; i < len; ++i ) {
      if ( this.hasOwnProperty[ i ] ) {
        if ( i === cur ) {
          fn && fn( this[ i ], i, this );
        }
      }
    }
  }
};