Object functional js

Object.filter.js

// Like underscore.js "filter", but returns an object with the keys and values
// instead of just an array of values.

Object.prototype.filter = function(obj, predicate) {
    var result = {}, key;
    
    for (key in obj) {
        if (obj.hasOwnProperty(key) && predicate(obj[key], key, obj)) {
            result[key] = obj[key];
        }
    }
    
    return result;
};

Object.map.js

// Like underscore.js "map", but returns an object with the keys and mapped values
// instead of just an array of mapped values.

Object.prototype.map = function(obj, fn) {
    var result = {}, key;
    
    for (key in obj) {
        if (obj.hasOwnProperty(key)) {
            result[key] = fn(obj[key], key, obj);
        }
    }
    
    return result;
};