function Fun() { return { defaultCompare: defaultCompare, insert: insert, map: map, mapFilter: mapFilter, isSet: isSet, 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 isSet(x) { return x != undefined; } }