class Enumerable
{
	var _table;

	function Enumerable(tbl) {
		this._table = tbl;
	}

	function Where(f) {
		var tbl = { };

		foreach (var v in this._table) {
			if (f(v))
				tbl[#tbl + 1] = v;
		}

		return Enumerable(tbl);
	}

	function Select(f) {
		var tbl = { };

		foreach (var v in this._table) {
			tbl[#tbl + 1] = f(v);
		}

		return Enumerable(tbl);
	}

	function First(f) {
		foreach (var v in this._table) {
			if (f(v))
				return v;
		}
	}

	function Any(f) {
		foreach (var v in this._table) {
			if (f(v))
				return true;
		}
		return false;
	}

	function Skip(n) {
		var tbl = { };
		var c = 0;

		foreach (var v in this._table) {
			if (c < n) {
				c = c + 1; // c++;
				continue;
			}
			tbl[#tbl + 1] = v;
		}

		return Enumerable(tbl);
	}

	function SkipWhile(f) {
		var tbl = { };
		var b = false;

		foreach (var v in this._table) {
			if (!f(v))
				b = true;
			if (b)
				tbl[#tbl + 1] = v;
		}

		return Enumerable(tbl);
	}

	function Reverse() {
		var tbl = { };

		foreach (var v in this._table) {
			table.insert(tbl, 1, v);
		}

		return Enumerable(tbl);
	}

	function Inherit(tbl) {
		var c = 1;

		foreach (var v in tbl) {
			if (!this._table[c]) {
				this._table[c] = v;
			}
			c = c + 1; // c++;
		}

		return Enumerable(tbl);
	}

	function Merge(tbl) {
		var c = 1;

		foreach (var v in tbl) {
			if (v is table && this._table[c] is table) {
				Enumerable(this._table[c]).Merge(v);
			} else {
				this._table[c] = v;
			}
			c = c + 1; // c++;
		}

		return Enumerable(this._table);
	}

	function Add(tbl) {
		foreach (var v in tbl) {
			this._table[#this._table + 1] = v;
		}

		return Enumerable(this._table);
	}

	function AddWhile(f) {
		var tbl = { };

		foreach (var v in this._table) {
			if (!f(v)) {
				break;
			}
			tbl[#tbl + 1] = v;
		}

		return Enumerable(tbl);
	}

	function Count()
	{
		return #this._table;
	}

	function ToTable()
	{
		return this._table;
	}
}