// --- Methods below provided by the Mozilla Foundation --- //
// -------------------------------------------------------- //

// Array.filter()
// --------------------------
if (!Array.prototype.filter) {
  Array.prototype.filter = function(fun) {
    var len = this.length;
    
    if (typeof fun != "function") {
      throw new TypeError();
    }
    
    var res = new Array();
    var thisp = arguments[1];
    
    for (var i = 0; i < len; i++) {
      if (i in this) {
        var val = this[i];
        
        if (fun.call(thisp, val, i, this)) {
          res.push(val);
        }
      }
    }
    
    return res;
  };
}

// Array.indexOf()
// --------------------------
if (!Array.prototype.indexOf) {
  Array.prototype.indexOf = function(elt) {
    var len = this.length;
    
    var from = Number(arguments[1]) || 0;
    from = (from < 0) ? Math.ceil(from) : Math.floor(from);
    
    if (from < 0) { from += len; }
    
    for (; from < len; from++) {
      if (from in this && this[from] === elt) {
        return from;
      }
    }
    
    return -1;
  };
}

// --- CUSTOM METHODS --- //
// ---------------------- //

// Array.found()
// --------------------------
if (!Array.prototype.found) {
  Array.prototype.found = function(v) {
    var r = false;
    var len = this.length;
    var s = 0;
    
    if (typeof v == "boolean" || typeof v == "number" || typeof v == "string") {
      for (; s < len; s++) {
        if (s in this && this[s] === v) {
          r = true;
        }
      }
    }
    
    return r;
  };
}

// Array.slap()
// - removes 1st item from the array, if any items exist
// --------------------------
if (!Array.prototype.slap) {
  Array.prototype.slap = function() {
    var len = this.length;
    var na = [];
    var first = 0;
    var slapped;
    var s = 0;
    var n = 0;
    
    var r = 0;
        if (arguments[0]) { if (typeof arguments[0] == "number") { r = (arguments[0] == 1 ? 1 : 0); } }
    
    if (len > 1) {
      for (; s < len; s++) {
        if (first == 0) {
          slapped = this[s];
          first++;
        } else {
          na[n] = this[s];
          this[n] = this[s];
          n++;
        }
      }
    }
    
    this.length = na.length;
    
    if (r == 1) {
      return slapped;
    }
  };
}

// Array.punch()
// - removes an item from the array, if it exists (1st occurence)
// - indicating '1' for the 2nd argument will remove all instances
// --------------------------
if (!Array.prototype.punch) {
  Array.prototype.punch = function(v) {
    var len = this.length;
    var s = 0;
    var n = 0;
    var na = [];
    
    var remove_all = Number(arguments[1]) || 0;
        if (remove_all !== 1 && remove_all !== 0) { remove_all = 0; }
    
    if (this.found(v) === true) {
      for (; s < len; s++) {
        if (s in this && this[s] !== v) {
          na[n] = this[s];
          this[n] = this[s];
          n++;
        }
      }
      
      this.length = na.length;
      
      if (remove_all == 1 && this.found(v) === true) {
        this.punch(v,1);
      }
    }
  };
}

// Array.push_unique()
// - adds an item to the array, if it is unique
// --------------------------
if (!Array.prototype.push_unique) {
  Array.prototype.push_unique = function(v) {
    if (this.found(v) === false) {
      this.push(v);
    }
  };
}

// Array.implode()
// --------------------------
if (!Array.prototype.implode) {
  Array.prototype.implode = function() {
    var len = this.length;
    var r = "";
    var s = 0;
    
    var d = arguments[0];
        if (typeof d != "string" && typeof d != "number") { d = ""; }
    
    if (len > 0) {
      for (; s < len; s++) {
        if (s in this && this[s] !== "") {
          r += this[s]+(s < (len-1) ? d : "");
        }
      }
    }
    
    return r;
  };
}