function Fun() {
	return {
		defaultCompare: defaultCompare,
		defined: defined,
		insert: insert,
		map: map,
		mapFilter: mapFilter,
		of: of,
		proj: proj
	};

	function insert(obj, t, compare, min, max) {
		min = min == undefined ? 0 : min;
		max = max == undefined ? t.length : max;
		compare = compare == undefined ? defaultCompare : compare;
		if(max - min < 1) {
			return min;
		}
		var avg = Math.floor((max + min) / 2);
		if (compare(obj, t[avg]) < 0) {
			return insert(obj, t, compare, min, avg);
		} else {
			return insert(obj, t, compare, avg+1, max);
		}
	}

	function defaultCompare(a, b) {
		if(a < b) {
			return -1;
		} else if(a > b) {
			return 1;
		} else {
			return 0;
		}
	}

	function map(mapper, f) {
		return function() {
			var args = Array.prototype.map.call(arguments, mapper);
			return f.apply(null, args);
		}
	}

	function of(o) {
		return function(key) {return o[key];};
	}

	function proj(key) {
		return function(o) {return o[key];};
	}

	function mapFilter(mapper, predicate) {
		return function(array) {
			return array.reduce(function(accumulator, elem) {
				var v = mapper(elem);
				return predicate(v) ? accumulator.concat(v) : accumulator;
			}, []);
		};
	}

	function defined(x) {
		return x != undefined;
	}
}